A hair dryer contains three heating elements - AQA - GCSE Physics - Question 6 - 2022 - Paper 1
Question 6
A hair dryer contains three heating elements.
Figure 7 shows the circuit diagram for the heating elements in the hair dryer.
In Figure 7 the heating elements are r... show full transcript
Worked Solution & Example Answer:A hair dryer contains three heating elements - AQA - GCSE Physics - Question 6 - 2022 - Paper 1
Step 1
Complete the sentence.
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Answer
The three resistors in Figure 7 are connected in parallel with the power supply.
Step 2
Which switch must always be closed for the hair dryer to work?
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Answer
The switch S1 must always be closed for the hair dryer to work.
Step 3
Which switches must be closed for the hair dryer to work at maximum power output?
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Answer
The switches S1, S2 and S3 must be closed for the hair dryer to work at maximum power output.
Step 4
Write down the equation which links energy transferred (E), power (P) and time (t).
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Answer
The equation that links energy transferred (E), power (P), and time (t) is given by:
E=P×t
Step 5
Calculate the time taken for the heating elements to reach normal operating temperature at maximum power output.
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Answer
Given that the power output is 1200 W and the energy required is 3600 J, we can use the equation:
3600=1200×t
Rearranging for time, we find:
t=12003600=3 s
Step 6
What is the circuit symbol for an LED?
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Answer
The circuit symbol for an LED is represented by the appropriate symbol (the one marked with a solid circle and arrows or another symbol based on standard LED representation).
