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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
(a) (i) 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.
Answer
To complete the circuit diagram:
- Connect a voltmeter in parallel with the device being tested. This allows for measuring the voltage across the device.
- Connect an ammeter in series with the device to measure the current that flows through the circuit. The ammeter can be placed either above or below the device in the drawing.
Step 2
(a) (ii) The technician tests a headlamp. The current in the headlamp is 4.8 A when connected to the 12V battery. Calculate the power supplied to the headlamp.
Answer
To calculate the power supplied to the headlamp, use the formula:
Where:
- is the power in watts (W),
- is the voltage in volts (V), and
- is the current in amperes (A).
Substituting the values:
Therefore, the power supplied to the headlamp is 58 W (when rounded).