The electrician should not change the shower unless he switches off the mains electricity supply. Explain why. The new shower has a power output of 10 690 W when it is connected to the 230 V mains electricity supply. The equation which links current, potential difference and power is: current = _____ power Calculate the current passing through the new shower. Give your answer to two significant figures. The new shower has a higher power rating than the old shower. How does the power of the new shower affect the cost of using the shower? Give a reason for your answer.

GCSE AQA Physics Current, Potential Difference & Resistance: The electrician should not chang

The electrician should not change the shower unless he switches off the mains electricity supply - AQA - GCSE Physics - Question 8 - 2018 - Paper 1

Question 8

The electrician should not change the shower unless he switches off the mains electricity supply. Explain why. The new shower has a power output of 10 690 W when i... show full transcript

Worked Solution & Example Answer:The electrician should not change the shower unless he switches off the mains electricity supply - AQA - GCSE Physics - Question 8 - 2018 - Paper 1

Step 1

The electrician should not change the shower unless he switches off the mains electricity supply. Explain why.

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Answer

The electrician should not change the shower while it is connected to the mains electricity supply because he may receive an electric shock or could be electrocuted. Touching live wires while working can lead to serious injury or death.

Step 2

Calculate the current passing through the new shower. Give your answer to two significant figures.

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Answer

To calculate the current, we use the formula:

$I = \frac{P}{V}$

where:

$P = 10,690 \, W$
$V = 230 \, V$

Substituting in the values:
$I = \frac{10,690}{230} \approx 46.4 \, A$

Thus, rounding to two significant figures, the current is 46 A.

Step 3

How does the power of the new shower affect the cost of using the shower? Give a reason for your answer.

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Answer

The cost is higher for the new shower because it has a higher power rating, meaning it uses more energy per second compared to the old shower. Higher energy usage leads to increased electricity costs.

The electrician should not change the shower unless he switches off the mains electricity supply - AQA - GCSE Physics - Question 8 - 2018 - Paper 1

Worked Solution & Example Answer:The electrician should not change the shower unless he switches off the mains electricity supply - AQA - GCSE Physics - Question 8 - 2018 - Paper 1

The electrician should not change the shower unless he switches off the mains electricity supply. Explain why.

Calculate the current passing through the new shower. Give your answer to two significant figures.

How does the power of the new shower affect the cost of using the shower? Give a reason for your answer.

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