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P7: Quiz 3

P7: Quiz 3

*Click here for a printable PDF of the circuit in this quiz.*

1) Give a definition and the units for the following:

a) Current

b) Potential difference

c) Resistance

2) Write down the equation that links current, potential difference and resistance. Also, write down the formula triangle.

3) A circuit contains a 4 Ω fixed resistor that has a potential difference across it of 12 V. Calculate the current.

4) A component has a resistance of 3 Ω and a current of 5 A. Calculate the potential difference across the component.

5) A component has a potential difference across it of 4 V and a current of 0.5 A. Calculate the resistance of the component.

6)

a)

i) What piece of equipment do we use to measure the potential difference across a component?

ii) Where must your answer to part ai be placed; in parallel or series?

b)

i) What piece of equipment do we use to measure the current?

ii) Where must your answer to part bi be placed; in parallel or series?

7) The circuit below consists of a cell and a filament bulb.

Draw on the pieces of equipment that we can use to measure the current and the potential difference for the filament bulb.

8) A filament bulb in a circuit has a potential difference across it of 1.8 V and a current of 0.4 A. Calculate the resistance of the filament bulb.

9) A light dependent resistor has a potential difference across it of 21 V and a resistance of 6 Ω. Calculate the current through the light dependent resistor.

10) Find the potential difference across an LED if the LED has a resistance of 1.4 Ω and a current of 6 A.

8) A filament bulb in a circuit has a potential difference across it of 1.8 V and a current of 0.4 A. Calculate the resistance of the filament bulb.

9) A light dependent resistor has a potential difference across it of 21 V and a resistance of 6 Ω. Calculate the current through the light dependent resistor.

10) Find the potential difference across an LED if the LED has a resistance of 1.4 Ω and a current of 6 A.