Energy and voltage in circuits

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Question 77

Medium

(i) State the relationship between power, current and voltage.

(ii) A ventilation fan motor with a power of $W1.8\text{ W}$ is connected to a $V12\text{ V}$ supply. Calculate the current in the fan.

[3]

Three switches, $K_1$ , $K_2$ and $K_3$ , are used to control a ventilation fan in a research laboratory. Each switch can be set to position $L$ or position $R$ , and changing any single switch toggles the fan on or off.

Diagram showing two circuit states of three switches K1, K2, and K3 controlling a ventilation fan

When all three switches are in position $L$ , the fan is ON. When all three switches are in position $R$ , the fan is OFF.

Complete the table by finding the three missing entries.

$K_1$	$K_2$	$K_3$	Fan
L	L	L	ON
R	R	R	OFF
L	R	L
R		L	ON
	R	R	OFF

[3]

Energy and voltage in circuits

Question 77

Energy and voltage in circuits Questions

Energy and voltage in circuits

Question 77

Energy and voltage in circuits Questions