NCERT Solution for Class 10 Science Chapter 13
Magnetic Effects of Electric Current
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Intext Questions
Page No-238
Questions No-2
An electric oven of 2 kW power rating is operated in a domestic electric circuit (220 V) that has a current rating of 5 A. What result do you expect? Explain.
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Power rating of electric oven P = 2 kW = 2000 W
Supply voltage V = 220 V
So, the current drawn by electric oven ๐ผ = ๐/๐ = 200 ๐/220 ๐ = 9 ๐ด
As the current rating of domestic electric circuit is only 5 A and the oven draws a current 9 A, which is more than the current rating, hence the circuit will be damaged due to overheating/overloading.
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We can calculate current drawn by electric oven is
Given – Power = 2kW = 2000 W
Potential difference of 220 W by applying the formula P = VI
By putting the value ,
I=2000/220= 9.09A
The current drawn by the electric oven can be calculated using following formula:
P=VI Or , I=P/V
We have; P = 2kW = 2000 W and V = 220 V
So, I=2000w/220V=9.09A
Here, the oven is drawing 9.09 ampere of current from a 5 ampere source.
This means there would be an overload on the circuit. This can result in accidental fire in the circuit.
To determine whether the operation of the electric oven in the domestic electric circuit is appropriate, you can use the formula:
Power (P) = Voltage (V) ร Current (I)
Power (P)=Voltage (V)รCurrent (I)
In this case, the power rating of the electric oven is given as 2 kW, and the voltage of the domestic electric circuit is 220 V. The current rating of the circuit is 5 A.
P = VรI
2 kW = 220 V ร 5 A
Now, let’s calculate the power:
2 kW = 1100W
So, the power consumed by the electric oven is 1100 W.
Given that the power rating of the oven is 2 kW (2000 W), and the actual power consumed is 1100 W, the operation is within the capacity of the domestic electric circuit. The circuit can handle the load of the electric oven, and there is a margin of safety.
In summary, the result is as expected, and the electric oven can be operated safely in the domestic electric circuit.