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April 26/28 Physics

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Table of Contents #. Date Title-Page – Page Number 29.April 14/15 Electrostatics 30.April 18/19 Electric Field 31.April 20/21 Electrostatics Problems 32.April 22/25 Circuits 33.April 26/28 Measuring Electricity 1

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Homework #4

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In: Label each diagram as series or parallel:

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Objective: To understand Ohms law and measure: Simple Series Parallel circuits Success criteria: Calculate and measure current, voltage and resistance.

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Amount of charge passing by every second: Current I=ΔQ Δt Measured in Amperes 1 Ampere= 1 Coulomb second

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If a current of 45.0 mA exists in a metal wire, how much charge goes through in 20 minutes? How many electrons flow past a given cross section of the wire in 10.0 min? Sketch the direction of the current and the direction of the electrons motion.

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Energy of each charge Electric potential V measured in Volts Energy charge

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Voltage is like a pinball machine pushing the electrons out of the source into the circuit

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Resistance to flow of electrons Resistance Measured in Ohms Ω

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Resistance slows down the flow of electrons –Voltage used up –Light emitted –Heat emitted

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How do you think the current would change if you increase the resistance in a circuit?

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How do you think the current would change in a circuit if you increase the voltage into a circuit?

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Ohms Law Georg Simon Ohm German physicist The relationship between current and voltage 1827

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Ohms Law V=IR

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A lightbulb has a resistance of 240 Ω when operating at a voltage of 120 V. What is the current in the bulb?

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A toaster has a resistance of 10 kΩ. How much current flows through it at a voltage of 120V?

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What is the resistance of a hair dryer if it runs at 120V with a current of 1 A?

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What is the current of a lightning bolt that has a voltage of 10 million volts through air with a resistance of 2 KΩ?

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Lab: Using a Multimeter Purpose: to measure circuits.

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How to measure resistance voltage and current

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Reading a Resistor

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Measuring Voltage -Direct measurement of the push -Connect directly to the battery (or circuit if you want to measure change in voltage)

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Measuring Resistance -Connect leads to resistor -Outside of a circuit

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Measuring Current Must be a circuit Circuit must include the meter

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Out: A hairdryer takes 1 amp of current at 120 V. What is its resistance?

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