the potential difference between the terminals of an electric heater is 80 volt when it draws a current of 5A from the sources what current will the heater draw if the potential difference is increased to 160 volt..
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if potential difference is increased by 160volt then the current drawn is 10 A
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Answer:
Current drawn by heater will be 2.5 A if potential difference is increased from 80 V to 160 V.
Explanation:
- The power rating of any electrical device is product of the potential difference and the current drawn by that device.
- Mathematically power, P = VI
- S.I. unit of power is Watt (W)
Given that :
- Potential difference, V = 80 V
- Current drawn = 5 A
- New potential difference, V' = 160 V
Solution :
- Power rating of electric heater is
- P = VI = 80 x 5 = 400W
- Since, power rating of a device is constant value.
- When heater is applied to potential difference of 160 V, current drawn by heater is
- 160 V x I' = 400 W
- I' = 400/160 A = 2.5 A.
- Hence, current drawn from the heater is 2.5 A when it is connected to potential difference of 160 V.
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