Match the following: (a) Electric power (i) volt (b) kWh (ii) joule (c) Electric current (iii) volt × ampere (d) Electrical energy (iv) watt (e) watt (v) ampere (f) Potential difference (vi) electrical energy

(a) Electric power - (iv) watt The SI unit of power is watt which is equal to one joule of electric energy consumed per second. (b) kWh - (vi) electrical energy Electrical energy is measured in kilowatt-hour. It is the energy consumed by a device with one kilowatt of power in one hour. (c) Electric current - (v) ampere Electric current is defined as the rate of flow of electric charge. The SI unit of current is ampere. (d) Electrical energy - (ii) joule The SI unit of energy is joule. One joule is equal to one watt of power utilized in a second. (e) watt - (iii) volt × ampere Power (P) is the rate at which energy is transferred or converted. It is equal to the product of current and voltage. The SI unit of power is the watt. 1 W = 1 V × 1 A . (f) Potential difference - (i) volt Volt is the unit of potential difference. If the supply is 220 volts means the potential difference is 220 volts in the circuit. The potential difference between any two point in an electric circuit carrying some current is defined as the work done to move a unit charge from one point to another point. (a) Electric power (iv) watt (b) kWh (vi) electrical energy (c) Electric current (v) ampere (d) Electrical energy (ii) joule (e) watt (iii) volt × ampere (f) Potential difference (i) volt

E M B I B E

Concise Physics Middle School for Class 8>Chapter 8 - Electricity>TEST YOURSELF>Q A

EASY

8th ICSE

IMPORTANT

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The electrical energy consumed in a house is measured by (electric meter/voltmeter).

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Important Questions on Electricity

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8th ICSE

IMPORTANT

Concise Physics Middle School for Class 8>Chapter 8 - Electricity>TEST YOURSELF>Q A

In a household electrical circuit, the appliance are connected in _____ with the mains.

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IMPORTANT

Concise Physics Middle School for Class 8>Chapter 8 - Electricity>TEST YOURSELF>Q A

A switch is connected to the _____(live/neutral/earth) wire.

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IMPORTANT

Concise Physics Middle School for Class 8>Chapter 8 - Electricity>TEST YOURSELF>Q A

The red colour insulated wire in a cable is the _____(live/neutral/earth) wire.

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IMPORTANT

Concise Physics Middle School for Class 8>Chapter 8 - Electricity>TEST YOURSELF>Q A

One kilowatt-hour is equal to _____

\times 10^{6}

joule.

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8th ICSE

IMPORTANT

Concise Physics Middle School for Class 8>Chapter 8 - Electricity>TEST YOURSELF>Q A

A fuse wire should have low _____ (melting point/resistance).

MEDIUM

8th ICSE

IMPORTANT

Concise Physics Middle School for Class 8>Chapter 8 - Electricity>TEST YOURSELF>Q A

Match the following:

(a) Electric power	(i) volt
(b) $kWh$	(ii) joule
(c) Electric current	(iii) volt $\times$ ampere
(d) Electrical energy	(iv) watt
(e) watt	(v) ampere
(f) Potential difference	(vi) electrical energy