a. Copy and complete the following sentences about household electrical devices. Use words from the list below. Each word may be used once, more than once or not at all.

chemical electrical heat kinetic light sound

i. In an iron, electrical energy is transferred into mainly _______ energy.

ii. In a vacuum cleaner, electrical energy is transferred into mainly _______ energy and unwanted _______ energy.

iii. in a torch, electrical energy is transferred into mainly _______ and _______ energy.

iv. In a hi-fi system, electrical energy is transferred into mainly _______ energy, and some unwanted _______ energy is also produced.

b. The list below contains some types of potential energy.

chemical elastic gravitational nuclear

Copy and complete the table below by naming the potential energy stored in each one. Use words from the list. Each word may be used once, more than once or not at all.

A bow about to fire an arrow
Water at the top of a waterfall
A birthday cake