GCSE AQA Physics Current, Potential Difference & Resistance: A hair dryer contains three heat

Question

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 represented by resistor symbols.

1. Complete the sentence.

The three resistors in Figure 7 are connected in _____________________ with the power supply.

2. Which switch must always be closed for the hair dryer to work? Tick (✓) one box.

S₁  ☐
S₂  ☐
S₃  ☐

3. Which switches must be closed for the hair dryer to work at maximum power output? Tick (✓) one box.

S₁ and S₂  ☐
S₁ and S₃  ☐
S₁, S₂ and S₃  ☐

4. Write down the equation which links energy transferred (E), power (P) and time (t).

5. The heating elements have a maximum power output of 1200 W.

The energy transferred to the heating elements to reach normal operating temperature is 3600 J.

Calculate the time taken for the heating elements to reach normal operating temperature at maximum power output.

Time = ________________ s

6. The hair dryer has LEDs to indicate the power setting. What is the circuit symbol for an LED? Tick (✓) one box.

☐
☐
☐
☐

A hair dryer contains three heating elements - AQA - GCSE Physics - Question 6 - 2022 - Paper 1