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Set EC3: Voltage-Current-Resistance 1

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Assignment Overview

Use the ∆V=I•R equation to solve for an unknown quantity when given the other two quantities. 

 1. EC3Q1
Points: 0/1

A power saw at the local hardware store boasts of having a 17.9-Amp motor. Determine its resistance when plugged into a 110-Volt outlet.

  1. Resistance

    Ohms

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 2. EC3Q2
Points: 0/1

A coffee cup immersion heater utilizes a heating coil with a resistance of 8.72 Ω. Determine the current through the coil when operated at 115 Volts.

  1. Current

    Amps

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 3. EC3Q3
Points: 0/1

A typical color television draws about 3.41 Amps when connected to a 110-Volt source. What is the effective resistance of the TV set?

  1. Resistance

    Ohms

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 4. EC3Q4
Points: 0/1

When operating at 110 volts, a resistor carries a current of 8.60 Amps. What current would be carried if the operation voltage is lowered to 87 Volts?

  1. Current

    Amps

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 5. EC3Q5
Points: 0/1

Lisa Honda pulls into the garage and turns off her car. She flips on the car's inside overhead lights so she can gather her belongings. The car's battery impresses 12 Volts across the light and the current in the light is 0.308 Amps. What is the power rating of the light bulb?

  1. Power

    Watts

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 6. EC3Q6
Points: 0/1

The headlight on a car has a resistance of 18.4 Ω and is powered by a 12-Volt battery. Calculate the current in the headlight.

  1. Current

    Amps

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 7. EC3Q7
Points: 0/1

An electric motor draws 3.88 Amps of current when connected to a voltage source. A quick measurement indicates that it has a resistance of 25.4 Ω, Determine the voltage of the voltage source.

  1. Voltage

    Volts

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