Question

☯︎An electrical appliance is rated as 60W- 150V.

★ What do you understand by this statement ?

★How much Current will flow through the appliance when in use ?
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☯︎ An electric iron of power 1.5 kW is used for 30 minutes to press clothes . Calculate the electrical energy consumed in :-

★Kilowatt Hour .

★Joule .

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Answer 1

Answer:

V stands for volts and Volts mean that how much electricity does the appliance take .

Explanation:

For example if a bulb has 1 v written then it needs that much amount of electricity

hope you understand

Answer 2

(a) 60 W -150 V power rating of appliance means, “If the appliance is put in the circuit on 15 0 volts, it will consume 60 w electrical power i.e. electric energy consumed by it in 1 sec. is 60 J.

(b) P = VI

∴ Current will through the appliance

I = P/V

= 60W/150W

= 0.4 A

(c) P = w/t

∴ Eelectrical energy

W = P × t P = 1.5 kW

t = 30 minute = 30/60 =1/2 hr

1.5 × 1/2 = 0.75 kwh

(d) 1 kWh = 3.6 × 106 J

∴ 75 kWh =0.75 × 3.6 × 106

= 2.700 × 106 = 2.7 × 106 J