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The voltage current values obtained from a transformer constructed by a student is shown in the following table. Primary coil secondary CoilVoltageCurrentPowerVoltageCurrentPower200 v 1 A ......100 v1/10 A ....1. Identify the transformer as step up or step down.2. How much power is wasted by the transformer?3. What are the possible energy losses in a transformer?4. If the input voltage is 48 v and input current is 1 A, is it possible to light 240 v, 100 w bulb using the above transformer. Justify. |
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Answer» 1. Step down transformer. 2. Power loss = 200w -10w = 190w 3. The possible energy losses in a transformer:
4. In this case input power = VI = 48 × 1 = 48 W. If transformer does not waste energy, input power = out put power. Hence maximum output power 48 W. But bulb requires 100 w. Hence the bulb does not glow with this low input power. |
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