Question 13:
A hot plate of an electric oven connected to a 220 V line has two resistance coils
A and B, each of 24 Ω resistances, which may be used separately, in series, or in
parallel. What are the currents in the three cases?
Answer:
Supply voltage, V = 220 V
Resistance of one coil, R = 24 Ω
(i) Coils are used separately
According to Ohm’s law,
V = I1R1
Where,
I1 is the current flowing through the coil
Therefore, 9.16 A current will flow through the coil when used separately.
(ii) Coils are connected in series
Total resistance, R2 = 24 Ω + 24 Ω = 48 Ω
According to Ohm’s law,
V = I2R2
Where,
I2 is the current flowing through the series circuit
Therefore, 4.58 A current will flow through the circuit when the coils are connected
in series.
(iii) Coils are connected in parallel
Total resistance, R3 is given as
According to Ohm’s law,
V = I3R3
Where,
I3 is the current flowing through the circuit
Therefore, 18.33 A current will flow through the circuit when coils are connected
in parallel.
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