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Question
What do you mean by power rating of an electrical appliance? How do you use it to calculate the resistance of the appliance.
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Solution
An electrical appliance such as electric bulb, geyser etc. is rated with power (P) and voltage (V) which is known as its power rating. For example: If an electric bulb is rated as 50W-220V, it means that when the bulb is lighted on a 220 V supply, it consumes 50 W electrical power.
To calculate the resistance of the appliance, the expression is:
Resistance, R =`("V"^2)/("P")`
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