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 cr... 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

The correct answer is B, where meter P is an ammeter and meter Q is a voltmeter. In this circuit, the arrangement allows the ammeter (P) to measure the current flowing through the component being investigated while the voltmeter (Q) measures the potential difference across the component.

Step 2

Calculate the voltmeter reading.

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Answer

To find 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), and
$R$ is the resistance (12 ohms).

Substituting the values:

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

Thus, the voltmeter reading is 6 V.

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