Energy and voltage in circuits

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Question 69

Medium

State the relationship between power, current and voltage.

[1]

A lamp with a power of $W3.6\text{ W}$ is connected to a $V12\text{ V}$ supply. Calculate the current in the lamp.

[2]

Three switches, $S_1$ , $S_2$ and $S_3$ , are used to control a lamp in a large room. Each switch can be up or down, and each switch can turn the lamp on or off.

Two circuit diagrams illustrating the operation of three switches, S1, S2, and S3, controlling a lamp connected to a 230 V a.c. supply.

When all three switches are up, the lamp is on. When all three switches are down, the lamp is off.

Complete the table by finding the three missing entries.

$S_1$	$S_2$	$S_3$	Lamp
up	up	up	on
down	down	down	off
up	down	up
down		up	on
	down	down	off

[3]

Energy and voltage in circuits

Question 69

Energy and voltage in circuits Questions

Energy and voltage in circuits

Question 69

Energy and voltage in circuits Questions