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A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24Ω resistance, which may be used separately, in series, or in parallel. What are the currents in the three cases? |
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Answer» (i) If coils are connected separately V = 220 V Resistance R1 = 240 As per ohm’s law, V = IR I = \(\frac{V}{R_1}=\frac{220}{24}\) = 9.166A ∴ If coils are connected separately 9.16A electricity flows in the coil. (ii) If coils are connected in series Resistance R2 = 24Ω + 24Ω = 48Ω As per ohm’s law V = IR ∴ I2 = \(\frac{V}{R_2}= \frac{220}{48}\) = 4.58A ∴ If coils are connected in series 4.58A electricity flows. |
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