Question
An electric bulb is connected to a 200 V generator. The current drawn by the bulb is 0.1 A. What is the power of the bulb?
The correct answer is
20 W
Power (P) is given by the formula: P = V × I
P = 200 V × 0.1 A
P = 20 W.
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Important Questions from Power in Electric Circuits
An electric bulb is connected to 220 V generator. The current drawn is 600 mA. What is the power of the bulb?
- What is the current required to light a 60 W incandescent bulb in a domestic supply of 240 V ?
What is the power factor for a purely inductive or purely capacitive AC circuit?
Convert $1 \text{ MWh}$ (megawatt-hour) into Joules.
- Two incandescent bulbs are rated at $P_1 = 200\,\text{W}$ and $P_2 = 100\,\text{W}$, respectively, when operated at a voltage of $V_{rated} = 220\,\text{V}$. If these two bulbs are connected in series across a $V_{supply} = 110\,\text{V}$ DC power supply, determine which bulb will glow brighter and by what factor compared to the other bulb.
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