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An electric heater draws 1000 watts from a 250V source. The power drawn from a 200V source is-
- a)800 W
- b)640 W
- c)1000 W
- d)1562.5 W
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
An electric heater draws 1000 watts from a 250V source. The power dra...
P = 1000/25 x 16 = 640W
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An electric heater draws 1000 watts from a 250V source. The power dra...
Given:
Power drawn from a 250V source = 1000W
To find:
Power drawn from a 200V source
Formula used:
Power (P) = Voltage (V) x Current (I)
Using Ohm's law, I = V/R where R is the resistance of the heater
Calculation:
Resistance of the heater = V^2/P = 250^2/1000 = 62.5Ω
Using the same resistance for the 200V source, we can find the power as follows:
I = V/R = 200/62.5 = 3.2A
P = VI = 200 x 3.2 = 640W
Therefore, the power drawn from a 200V source is 640W which is option (B).
Power drawn from a 250V source = 1000W
To find:
Power drawn from a 200V source
Formula used:
Power (P) = Voltage (V) x Current (I)
Using Ohm's law, I = V/R where R is the resistance of the heater
Calculation:
Resistance of the heater = V^2/P = 250^2/1000 = 62.5Ω
Using the same resistance for the 200V source, we can find the power as follows:
I = V/R = 200/62.5 = 3.2A
P = VI = 200 x 3.2 = 640W
Therefore, the power drawn from a 200V source is 640W which is option (B).
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An electric heater draws 1000 watts from a 250V source. The power drawn from a 200V source is-a)800 Wb)640 Wc)1000 Wd)1562.5 WCorrect answer is option 'B'. Can you explain this answer?
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