A technician investigates different electrical devices that are used in a car - Edexcel - GCSE Physics - Question 8 - 2021 - Paper 1
Question 8
A technician investigates different electrical devices that are used in a car.
The technician connects a device to the 12V car battery.
The technician measures the... show full transcript
Worked Solution & Example Answer:A technician investigates different electrical devices that are used in a car - Edexcel - GCSE Physics - Question 8 - 2021 - Paper 1
Step 1
Draw on Figure 17 to show how the circuit should be completed so that the current in the circuit and voltage across the device can be measured.
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Answer
To complete the circuit in Figure 17, connect a voltmeter in parallel with the device being tested and an ammeter in series with the circuit. This setup allows for accurate measurement of both the current (using the ammeter) and the voltage (using the voltmeter) across the device.
Step 2
Calculate the power supplied to the headlamp.
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Answer
To calculate the power supplied to the headlamp, we can use the formula:
extPower(P)=extVoltage(V)imesextCurrent(I)
Substituting the known values:
P=12extVimes4.8extA=57.6extW
Thus, the power supplied to the headlamp is approximately 58 W.
