Example 1 · level 1
An appliance draws 4 A from the 220 V mains. Find its power (in W).
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- P = 220 × 4 = 880 W.
Answer: 880 W
CLASS 10 SCIENCE · ELECTRICITY
Electric power (P = VI = I²R = V²/R)
P = VI = I²R = V²/R, in watts. Appliances on household supply (220 V) are connected in parallel.
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Worked examples
Example 2 · level 2
A 1000 W, 220 V appliance is used on the mains. Find the current it draws (in A, correct to 2 decimal places).
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- I = 1000 ÷ 220 = 4.55 A.
Answer: 4.55 A
Example 3 · level 3
In Vihaan's kitchen a 1500 W induction cooktop and a 440 W mixer run together on 220 V mains (in parallel). Find the total current drawn (in A, correct to 2 decimal places).
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- Total P = 1940 W.
- I = 1940 ÷ 220 = 8.82 A.
Answer: 8.82 A