What is the power input to an electric heater that draws 4 amperes from 250v supply source?
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Answered by
2
How much current is drawn from the 200 volt source? If the load is a simple resistor, which doesn't change in value with a change in temperature, then you just use ohm's law I = E / R.
What is R? Under normal operating conditions power is voltage times current. So I = P / V = 1000/250 = 4 amps.
Now R = E / I = 250/4 = 62.5
P = (I*2) x R = 16 x 62.5 = 1000 or
P = (V*2)/R = 62,500 / 62.5 = 1000
If the resistance of the load stays the same, then Power
P = (V*2)/R = 200*2 / 62.5 = 40,000 / 62.5 = 640W
If the resistance changes with temperature, then this would not be correct.
What is R? Under normal operating conditions power is voltage times current. So I = P / V = 1000/250 = 4 amps.
Now R = E / I = 250/4 = 62.5
P = (I*2) x R = 16 x 62.5 = 1000 or
P = (V*2)/R = 62,500 / 62.5 = 1000
If the resistance of the load stays the same, then Power
P = (V*2)/R = 200*2 / 62.5 = 40,000 / 62.5 = 640W
If the resistance changes with temperature, then this would not be correct.
Answered by
2
I = 4A
V = 250V
Power input = VI
= 250×4 =1000W
Hope it helped u.
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