Some students investigate the electrical resistance of different components using this circuit. Which row of the table is correct for both meters P and Q? Put a cross (X) in the box next to your answer. meter P is meter Q is A an ammeter an ammeter B an ammeter a voltmeter C a voltmeter a voltmeter D a voltmeter an ammeter One of the components being investigated is a 12 ohm resistor. When it is in the circuit, the ammeter reading is 0.50 A. Calculate the voltmeter reading.

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Some students investigate the electrical resistance of different components using this circuit - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1

Question 1

Some students investigate the electrical resistance of different components using this circuit. Which row of the table is correct for both meters P and Q? Put a cro... show full transcript

Worked Solution & Example Answer:Some students investigate the electrical resistance of different components using this circuit - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1

Step 1

Which row of the table is correct for both meters P and Q?

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Answer

For this question, we need to identify the correct function of each meter. Given that meter P is connected in series (suggesting it is measuring current) and meter Q is connected in parallel (suggesting it is measuring voltage), the correct identification will be:

Meter P is an ammeter (which measures current).
Meter Q is a voltmeter (which measures voltage).

Thus, the correct choice is B: 'an ammeter' for meter P and 'a voltmeter' for meter Q.

Step 2

Calculate the voltmeter reading.

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Answer

To calculate the voltmeter reading, we can use Ohm's Law, which states:

$V = I imes R$

Where:

$V$ is the voltage (voltmeter reading)
$I$ is the current (0.50 A)
$R$ is the resistance (12 ohms)

By substituting in the values:

$V = 0.50 ext{ A} imes 12 ext{ ohms} = 6 ext{ V}$

Therefore, the voltmeter reading is 6 V.

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