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Question
What do you mean by power rating of an electrical appliance? How do you use it to calculate the safe limit of current in it, while in use?
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.
The safe limit of current I is : I = `"P"/"V"`
RELATED QUESTIONS
What do you mean by power rating of an electrical appliance? How do you use it to calculate the resistance of the appliance.
An electrical appliance has a rating 100 W, 120 V. The resistance of element of appliance when in use is ______.
Explain the meaning of the statement 'the power of an appliance is 100 W'.
An electrical appliance having a resistance of 200 Ω is operated at 200 V. Calculate the energy consumed by the appliance in 5 minutes in joules.
'A geyser is rated 240 W-220 V'. Explain the meaning of this statement.
