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An electrician is replacing an old electric shower with a new one - AQA - GCSE Physics - Question 8 - 2018 - Paper 1
Question 8
An electrician is replacing an old electric shower with a new one. The inside of the old shower is shown in Figure 11. Figure 11 08.1 The electrician should not ch... show full transcript
Worked Solution & Example Answer:An electrician is replacing an old electric shower with a new one - 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.
Answer
The electrician should switch off the mains electricity supply to prevent the risk of an electric shock or electrocution. If he touches live wires while the power is on, electricity could flow through his body, potentially causing serious injury or death.
Step 2
Calculate the current passing through the new shower. Give your answer to two significant figures.
Answer
Using the equation linking current (I), power (P), and potential difference (V):
Substituting the values:
Calculating:
Rounded to two significant figures, the current is:
Current = 47 A
Step 3
How does the power of the new shower affect the cost of using the shower? Give a reason for your answer.
Answer
The power of the new shower is higher, which means it uses more energy per second. As a result, the cost of using the shower will be higher because higher energy consumption leads to increased electricity bills.