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

The switch S_1 must always be closed for the hair dryer to work.

The switches S_1, S_2 and S_3 must all be closed for the hair dryer to work at maximum power output.

The equation linking energy transferred (E), power (P) and time (t) is given by: $E = P imes t$

Given:

• Energy transferred, $E = 3600 ext{ J}$
• Power output, $P = 1200 ext{ W}$

Using the equation: $E = P imes t$ We can rearrange it to find time: $t = \frac{E}{P} = \frac{3600}{1200} = 3 ext{ s}$

So, the time taken is 3 s.

The circuit symbol for an LED is represented as:

• (Symbol Option)