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Ohm’s Law

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Ohm’s Law

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**Measuring Current Current is measured in units of amperes (A)**

In a series circuit, current is the same at all the points In a parallel circuit, current is shared between all the points

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**What is the current? SERIES CIRCUIT PARALLEL CIRCUIT 3A 3A 4A 1A 4A 1A**

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Measuring Voltage Voltage – the electrical push that a cell/battery gives to the current Voltage is also known as Potential Difference Voltage is measured in units of volts (V)

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Measuring Voltage 3V 1.5V 3V In a series circuit, voltage is shared between all the points In a parallel circuit, voltage is the same at all the points

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**What is the current and voltage?**

Series Same Shared Parallel

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**What is the current and voltage?**

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Measuring Resistance Resistance – slows down current, adding components to a circuit increases resistance Resistance is measured in units of ohms (Ω) More resistance = Less current = Less light In a series circuit, add up all resistance to get total.

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Electrical Power

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What is the current?

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What is the current?

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What is the current?

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**How much voltage gives 5 amps of current through a 3 Ω light bulb?**

I = V/R V = (5A) (3Ω) V = 15V

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**How much current flows in a circuit with a 1**

How much current flows in a circuit with a 1.5 volt battery and three 1 ohm resistances (bulbs) in series? I = V/R I = (1.5V) / (3Ω) I = .5A

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

In a series circuit, voltage is shared between all the points 9V/3 = 3V

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**A light bulb with a resistance of 1. 5Ω is connected to a 1**

A light bulb with a resistance of 1.5Ω is connected to a 1.5V battery in the circuit. Calculate the power used by the light bulb? P = IV I = V/R I = (1.5V) (1.5Ω) I = 2.25A P = (2.25A) (1.5V) P = W

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