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One of the differences/similarity, in the operation of a transistor amplifier, and a step–up transformer, is (1) In transistor, if voltage increases, current also increases, in step–up transformer, if voltage increases, current decreases(2) In transistor, if voltage increases, current increase; in step–up transformer, if voltage increase, current increases(3) In both of them, if voltage increases, current also increases(4) In both of them, if voltage increases, current decreases |
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Answer» Correct option: (1) Explanation: The transistor can bring about an increases in voltage along with an increase in current. This is because the increased power, in the ‘output’ of a transistor, comes at the expense of the power supplied by the biasing battery. In a step–up transformer, there is no such power source. Hence the ‘output’ power – even in the case of an ideal transformer – can at best be equal to the ‘input’ power. The increase in voltage, here, is accompanied by a decrease in current, and vice–versa. |
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