Question

An electric motor is rated 1.5 KW - 250 we calculate (a) the current flowing into the motor (b) the energy consumed in 1 second (c) that time in which it will consume 90 kwh of energy

Answer 1

(a)Current = 6 Amp.(b) Energy consumed in 1 second = 1500 joules. (c) That time =60sec.

Given:

Electric power = 1.5KW = 1500 W    voltage = 250 v

To find:

(a) The current flowing into the motor.

(b) The energy consumed in 1 second.

(c) That time in which it will consume 90 kwh of energy.

Formula used:

Electric power = voltage × current

Explanation:

(a) The current flowing into the motor.

Electric power = voltage × current

              1500  = 250 × current

           Current = $\frac{1500}{250}$ = 6 Amp.

(b) The energy consumed in 1 second.

Electric power = 1500 W = 1500 Joules per second.

So the energy consumed in 1 second = 1500 Joules.

(c) That time in which it will consume 90 kwh of energy.

Energy consumption = 90 kwh =$\frac{90}{1}$ = 90 KW.

So that time = $\frac{Electric\ power}{Energy\ consumption}$ = $\frac{90}{1.5}$ = 60 sec.

To learn more....

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2)One thousand watts of electric power are transmitted to a device by means of two wires, each of which has a resistance of 2 ohms. If the resulting potential difference across the device is 100 volts, the potential difference across the source supplying the power is: A. 20 V B. 40 V C. 100 V D. 140 V E. 500 V.

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Answer 2

Explanation:

(a)Current is 6 Amp.

(b) Energy used in 1 second is 1500 joules.

(c) time is 60sec.

Electric power is 1.5KW i.e., 1500 W    

voltage = 250 v

We have to find:

(a) The current flowing into the engine.

(b) The power used in 1 second.

(c) time in which it will use 90 kWh of electricity.

Formula

Electric power = VxI

(a) The current flowing into the engine.

 1500  = 250 × current

I = 6 Amp.

(b) The energy used in 1 second.

Electric power = 1500 W .

Therefore, energy used in 1 second = 1500 Joules.

(c) Time in which it will use 90 kWh of energy.

Energy used = 90 kwh

Therefore, Time = 60 second

To learn more:

i)An electric motor of power 200 w is switched on for 1 minute and 40 ...

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ii)An electric motor raises a load of 0.2 kg, at a constant speed ...

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