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**What happens to the brightness of each bulb in a series circuit…**

What happens to the brightness of each bulb in a series circuit…..if you add more bulbs?

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**The current in a DC series circuit:**

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**The current in a DC series circuit:**

Is the same in all points of the circuit

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If you compare an electrical circuit to a system that carries water, what would the water pipes represent?

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If you compare an electrical circuit to a system that carries water, what would the water pipes represent? WIRES

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**The ability of an object to resist current is called:**

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**The ability of an object to resist current is called:**

Electrical resistance

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**Objects that conduct electricity poorly are called =**

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**Objects that conduct electricity poorly are called =**

= INSULATORS

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**A circuit with a switch turned to the OFF position or a circuit with any break is called:**

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**A circuit with a switch turned to the OFF position or a circuit with any break is called:**

OPEN CIRCUIT

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**WHOLE BRAIN TIME Please turn to your partner and discuss**

- The current in DC circuits - Insulators - electrical resistance - wires are like what?

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**WHAT Type of Circuits ARE THEY?**

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**The mathematical relationship between current, voltage, and resistance is known as:**

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**The mathematical relationship between current, voltage, and resistance is known as:**

OHM’s LAW

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**What is the current in each resistor in the circuit?**

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**What is the current in each resistor in the circuit?**

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WHOLE BRAIN TIME -- Turn to your partner and discuss --When do you use that weird formula --Will that weird formula be on the test --How do you find current in a parallel circuit

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A circuit diagram: =

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A circuit diagram: = makes wiring easier =

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A circuit diagram: = makes wiring easier = uses symbols to represent each part of the circuit =

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A circuit diagram: = makes wiring easier = uses symbols to represent each part of the circuit = can be interpreted (understood) by anyone familiar with electricity

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A circuit diagram: = makes wiring easier = uses symbols to represent each part of the circuit = can be interpreted (understood) by anyone familiar with electricity

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A closed Circuit is =

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**A closed Circuit is = = ON **

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**In many circuit diagrams, any device that uses electrical energy is represented by a:**

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**In many circuit diagrams, any device that uses electrical energy is represented by a:**

resistor

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**A device that uses chemical energy to push current in a circuit is called a =**

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**A device that uses chemical energy to push current in a circuit is called a =**

= A BATTERY

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WHOLE BRAIN TIME -- Turn to your partner and discuss --What does a battery do --When is a resistor shown --How do you know it is a closed circuit -Talk about a circuit diagram

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**Electrical current will pass easily through =**

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**Electrical current will pass easily through =**

= CONDUCTOR

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**As Jing toasts her morning waffle in the family toaster, 3**

As Jing toasts her morning waffle in the family toaster, 3.0 amperes of current flows with a voltage of 150 volts across the toaster. The resistance of the toaster is:

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**As Jing toasts her morning waffle in the family toaster, 3**

As Jing toasts her morning waffle in the family toaster, 3.0 amperes of current flows with a voltage of 150 volts across the toaster. The resistance of the toaster is:

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**As Jing toasts her morning waffle in the family toaster, 3**

As Jing toasts her morning waffle in the family toaster, 3.0 amperes of current flows with a voltage of 150 volts across the toaster. The resistance of the toaster is:

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**As Jing toasts her morning waffle in the family toaster, 3**

As Jing toasts her morning waffle in the family toaster, 3.0 amperes of current flows with a voltage of 150 volts across the toaster. The resistance of the toaster is:

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**As Jing toasts her morning waffle in the family toaster, 3**

As Jing toasts her morning waffle in the family toaster, 3.0 amperes of current flows with a voltage of 150 volts across the toaster. The resistance of the toaster is:

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**As Jing toasts her morning waffle in the family toaster, 3**

As Jing toasts her morning waffle in the family toaster, 3.0 amperes of current flows with a voltage of 150 volts across the toaster. The resistance of the toaster is:

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**A stereo receiver is plugged into a 120-volt outlet**

A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

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**A stereo receiver is plugged into a 120-volt outlet**

A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

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**A stereo receiver is plugged into a 120-volt outlet**

A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

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**A stereo receiver is plugged into a 120-volt outlet**

A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

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**A stereo receiver is plugged into a 120-volt outlet**

A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

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**A stereo receiver is plugged into a 120-volt outlet**

A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

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**A stereo receiver is plugged into a 120-volt outlet**

A stereo receiver is plugged into a 120-volt outlet. If the receiver has a resistance of 360 ohms, how much current does it use?

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What happens to the current in a circuit with fixed voltage if you increase the resistance of the circuit?

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What happens to the current in a circuit with fixed voltage if you increase the resistance of the circuit?

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What happens to the current in a circuit with fixed voltage if you increase the resistance of the circuit?

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**A light bulb requires 3 amps to produce light**

A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

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**A light bulb requires 3 amps to produce light**

A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

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**A light bulb requires 3 amps to produce light**

A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

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**A light bulb requires 3 amps to produce light**

A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

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**A light bulb requires 3 amps to produce light**

A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

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**A light bulb requires 3 amps to produce light**

A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

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**A light bulb requires 3 amps to produce light**

A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

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**A light bulb requires 3 amps to produce light**

A light bulb requires 3 amps to produce light. The resistance of the bulb is 4 ohms. How many batteries do you need if each battery is 1.5 volts?

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**Total Voltage = Total Resistance =**

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**Total Voltage = 9 V Total Resistance =**

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**Total Voltage = 9 V Total Resistance = 4.5 ohms**

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**Total Voltage = 9 V Total Resistance = 4.5 ohms**

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**Total Voltage = 9 V Total Resistance = 4.5 ohms**

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**Total Voltage = 9 V Total Resistance = 4.5 ohms**

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**Total Voltage = 9 V Total Resistance = 4.5 ohms**

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**Total Voltage = 9 V Total Resistance = 4.5 ohms**

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**Total Voltage = 9 V Total Resistance = 4.5 ohms**

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**What is the voltage drop across each resistor?**

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**What is the voltage drop across each resistor?**

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**What is the voltage drop across each resistor?**

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**What is the voltage drop across each resistor?**

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**What is the voltage drop across each resistor?**

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**So in a series circuit (like the one we just did), what can we say about voltage drops?**

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So in a series circuit (like the one we just did), what can we say about voltage drops? If you add all the voltage drops ( ) = EQUALS the total Voltage…..right?

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**Is current the same though all components of a series circuit?**

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**The current in each resistor is?**

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**The current in each resistor is?**

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**The current in each resistor is?**

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**The current in each resistor is?**

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**Is the current the same across each of these resistors? Why or Why not?**

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**Is the current the same across each of these resistors? Why or Why not?**

YES……because…..?

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**Is the current the same across each of these resistors? Why or Why not?**

YES……DC circuit

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**Is the current the same across each of these resistors? Why or Why not?**

YES……DC circuit To calculate but Use Total Resistance

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Electrical Systems. VOCABULARYOBJECTIVES Series circuit Voltage drop Kirchoff’s Voltage Law Describe a series circuit. Calculate the resistance.

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