Physics · May / June 2017 · Paper 11 · Question 39

A student uses a transformer to light a filament lamp using a 230 V a.c. supply. The lamp has a maximum voltage rating of 6.0 V. [diagram: transformer with 300 turns primary connected to 230 V a.c. and 20 turns secondary connected to a filament lamp] What happens when the circuit is switched on?

1. AThe lamp does not light at all.
2. BThe lamp lights dimly.
3. CThe lamp lights at normal brightness.
4. DThe lamp lights up brightly and then goes out.

As printed in the paper