Question

(a) Complete the following sentences using the words shown. Each term may be used once, more than once or not at all. current ohms charge newtons resistance volts
A flow of electrons is called a …………………………. .
Electromotive force (e.m.f.) is measured in …………………………. .
To calculate the resistance of a component you divide the voltage by the ……………………….. . 
(b) Energy transfers occur when electrical energy is supplied to a lamp. Fig. 12.1 shows a lamp
and the energy transfers.

Use information from Fig. 12.1 to calculate the wasted energy.
wasted energy = ……………………………………………… J 

(c) Fig. 12.2 shows a ray of light from the lamp entering a glass block.

(i) On Fig. 12.2 continue the path of the ray into the block as it is refracted. 
(ii) On Fig. 12.2 label the angle of incidence with an i and the angle of refraction with an r. 
(d) Fig. 12.3 represents a visible light wave.

(i) On Fig. 12.3 use a double-headed arrow (↔ or ↕) and the letter W to show one wavelength. 
(ii) On Fig. 12.3 use a double-headed arrow (↔ or ↕) and the letter A to show the amplitude of the wave.