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    sakthi vel's Avatar
    sakthi vel Posts: 1, Reputation: 1
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    #1

    Jun 20, 2012, 08:08 AM
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    An electric geyser is known to consume 2.2 units of electrical energy per hour of its use. It is designed to work on the main voltage of 220V.
    1.what is 'power rating' of this device.
    2.what is the current flowing through the device when it is connected across the mains
    3.what is the resistance of this device
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Jun 20, 2012, 08:18 AM
    Quote Originally Posted by sakthi vel View Post
    an electric geyser is known to consume 2.2 units of electrical energy per hour of its use. it is designed to work on the main voltage of 220V.
    1.what is 'power rating' of this device.
    Power is measured in energy per unit time. You are told it uses 2.2 "units" of energy per hour, so the power usage should be obvious.

    Quote Originally Posted by sakthi vel View Post
    2.what is the current flowing through the device when it is connected across the mains
    Power = voltage times current. You have numbers for power and voltage, so you can calculate current.

    Quote Originally Posted by sakthi vel View Post
    3.what is the resistance of this device
    Use Power = I^2R, or Power = V^2/R, to find the value of R.
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