CP11 Physics - Transformers questions with correct answers 2025.

CP11 Physics - Transformers questions
with correct answers 2025.




What do transformers change? - ANSWER: Voltage/current
Transformers are used to change the potential difference (voltage) of an electricity
supply.

What is the difference between a step-up and a step-down transformer? - ANSWER: A
step-up transformer is used to increase the potential difference of an electricity supply.
A step-down is used to decrease the potential.
A step-up transformer increases the voltage and decreases the current at the same
time. A step-down decreases the voltage and increases the current at the same time.

Electrical Power =
(W) - ANSWER: current x potential difference (voltage)
(A) x (V)

Can also be written as
P=IxV

Describe a transformer - ANSWER: A primary coil and a secondary coil, wrapped
around an iron core. There is no electrical connection between the two coils.

What is electromagnetic induction? - ANSWER: The creation of a voltage in a wire
which is experiencing a change in magnetic field.
A voltage in one coil causes (induces) a voltage in another.

What is the potential difference? - ANSWER: is a measure of the energy transferred by
each coulomb of care that flows through the wire.