A technician investigates the potential difference (voltage) across an electrical heater. This circuit diagram shows the circuit the technician uses. This circuit diagram shows the circuit the technician uses: - heater - variable resistor - 12V (i) Add a voltmeter to the circuit which will measure the potential difference (voltage) across the heater. (ii) The resistance of the heater is 15 Ω. The current in the heater is 0.56 A. Calculate the potential difference (voltage) across the heater.

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A technician investigates the potential difference (voltage) across an electrical heater - Edexcel - GCSE Physics - Question 4 - 2015 - Paper 1

Question 4

A technician investigates the potential difference (voltage) across an electrical heater. This circuit diagram shows the circuit the technician uses. This circuit ... show full transcript

Worked Solution & Example Answer:A technician investigates the potential difference (voltage) across an electrical heater - Edexcel - GCSE Physics - Question 4 - 2015 - Paper 1

Step 1

Add a voltmeter to the circuit which will measure the potential difference (voltage) across the heater.

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Answer

To measure the potential difference across the heater, the voltmeter should be connected in parallel with the heater. Represent the voltmeter using the appropriate symbol and connect it across the terminals of the heater.

Step 2

The resistance of the heater is 15 Ω.

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Answer

Using Ohm's Law, the potential difference (V) can be calculated using the formula:

$V = I \times R$

Substituting in the values:

$V = 0.56 \text{ A} \times 15 \text{ Ω}$

Calculating:

$V = 8.4 \text{ V}$

Step 3

Calculate the potential difference (voltage) across the heater.

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Answer

The calculated potential difference across the heater is 8.4 V.

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