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P2: Quiz 3 – Answers
P2: Quiz 3 – Answers
1)
a) Current is the flow of electrical charge around a circuit per second. We measure current in ampere/ amps (A)
b) Potential difference is the driving force that pushes the electrical charge around a circuit. Potential difference is measured in volts (V)
c) Resistance opposes the flow of electrical charge (current) in a circuit. Resistance converts electrical energy into thermal energy. Resistance is measured in ohms (Ω)
2) V = I x R
or
potential difference = current x resistance
a) Current is the flow of electrical charge around a circuit per second. We measure current in ampere/ amps (A)
b) Potential difference is the driving force that pushes the electrical charge around a circuit. Potential difference is measured in volts (V)
c) Resistance opposes the flow of electrical charge (current) in a circuit. Resistance converts electrical energy into thermal energy. Resistance is measured in ohms (Ω)
2) V = I x R
or
potential difference = current x resistance
3) 3 A
4) 15 V
5) 8 Ω
6)
a)
i) Voltmeter
ii) Parallel
b)
i) Ammeter
ii) Series
7) The voltmeter needs to be placed in parallel around the filament bulb. The ammeter needs to be placed in series.
8) 4.5 Ω
9) 3.5 A
10) 8.4 V
Questions
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.
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.