# Class 10 FRANK Solutions Physics Chapter 4.2 - Electrical Power and Household Circuits

Revise concepts using Frank Solutions for ICSE Class 10 Physics Chapter 4.2 Electrical Power and Household Circuits. Revise the differences between electrical energy and electric power. In addition, the chapter concepts you can learn from Frank Solutions include fuse, Joule’s law, electrical resistance, earthing etc.

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## Electrical Power and Household Circuits Exercise 187

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Electrical appliances come with certain number of watts and volts written on them. Power rating of an electrical appliance gives the knowledge of the safe current limit of an appliance and also indicates the voltage above which the appliance should not be used.

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A fuse is generally made of an alloy of lead and tin.

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(i) It should have low melting point.

(ii) It should have high resistance.

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(i) resistance, melting point

(ii) low, lead, tin, melts.

(iii) series, live

## Electrical Power and Household Circuits Exercise 188

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Switches are always connected in the live wire of circuits so that when a switch is in 'off' position, no current flows through the appliance and its live and neutral wires are at same potential and it is safe to touch the live wire leading to the appliance, even when the fuse is blown.

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International convention of colour coding:

1. Live wire - Brown

2. Neutral wire - Light blue

3. Earth wire - Green or yellow

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The SI unit of electrical power is watt.

(i) Kilowatt-hour is the household unit of electrical energy. It is defined as the quantity of electrical energy consumed in 1 hour when the rate of consumption is 1000 watts, i.e. 1000 J/s.

(ii) A voltage of 220 volt is generally supplied to a house.

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(i) Earth pin: It provides connection for earthing.

(ii) Neutral pin: It provides connection to the neutral wire.

(iii) live pin: It provides connection to the live wire.

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## Electrical Power and Household Circuits Exercise 189

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We know,

P = VI

Thus,

I = P/V = 40/220 = 0.18 A

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One watt-hour is the electrical energy consumed by an electrical appliance of power 1 watt when it is used for 1 hour.

1Wh = 3600 J