An electric heater rated 1100 W operates at 220 V . Calculate (1) it's resistance , and (2) The current drawn by it .
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An electric heater rated 1100 W operates at 220 V . Calculate (1) it's resistance , and (2) The current drawn by it .
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Answer:
Power= 1100W
Potential Difference=220V
Resistance= 44 ohm
Current= 5A
Explanation:
1- P=V*2/R
R= V*2/P
R= 220*2 / 1100
R= 48400/ 1100
R= 44 ohm
2- V/I= R
I= V/R
I= 220/44
I= 5 A
Concept:
The rate at which energy is transported is referred to as power. The number of Joules per second of energy utilised to drive something is measured as power. Efficiency is a number between 0 and 1 that indicates how efficient something is. The machine is perfectly efficient if the efficiency is equal to one. If the efficiency is 0, the machine loses all of its input power and is unable to produce any energy.
Find:
(1) Resistance of heater.
(2) Current drawn by heater.
Solution:
Power = Voltage * current
[tex]1100=220*I\\I=\frac{1100}{220} \\I=5A[/tex]
[tex]R=\frac{V}{I}\\\\ R=\frac{220}{5} \\\\R=44ohm[/tex]
Hence, the resistance of the heater is [tex]44ohm[/tex] and current drawn by it is [tex]5A[/tex].
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