In a CE transistor amplifier there is a current and voltage gain associated with the circuit. In other words there is a power gain. Considering power a measure of energy, does the circuit violate conservation of energy?

A step up transformer converts a low input voltage into a high output voltage. Does it violate law of conservation of energy? Explain.

In an a.c. circuit, with phase voltage V and current I, the power dissipated is

In a common base transistor amplifier, if the input resistance is 200 ohm and load resistance is 20 kiloohm, find power gain. Given current gain of common base trasistor is 0.95

For a transistor amplifier, the collecor load resistance R_(L) = 2k ohm and the input resistance R_(i) = 1k ohm . If the current gain is 50, calculate voltage gain of the amplifier.

An electron microscope uses electron accelerated by a voltage of 50kV. Determine the de-Broglie wavelengths associated with the electrons. If other factors (such as numerical aperture etc) are taken to be roughly the same how does the resolving power of electron microscope compare with that of an optical microscope which uses yellow light?

In a common base transistor amplifier, if the input resistance is 200 ohm and load resistance is 20 kiloohm, find Voltage gain Given current gain of common base trasistor is 0.95

In a series LCR circuit R = 200 Omega and the voltage and the frequency of the main supply is 220 V and 50 Hz respectively. On taking out the capacitance from the circuit the current lags behind the voltage by 30^@ . On taking out the inductor from the circuit the current leads the voltage by 30^@ . The power dissipated in the LCR circuit is

Describe briefly, with the help of a lablled diagram, working of a step-up transformer. A step up transformer converts a low voltage in to high voltage. Does it not violate the principle of conservation of energy?

Direction. In the follwing questions, a statement of assertion is followed by a statement of reason. While answering a question, you are required to choose the correct are out of the given four responses and mark it as (A). If both assertion and reason are true and reason is the correct explanation of the assertion, (B) if both assertion and reason are true but reason is not correct explanation of the assertion. (C) if asssertion is true, but reason if false, (D) if both assertion and reason are false Assertion : Kirchhoff's first law for electrical circuits acounts for conservation of charge. While the second law conservation of energy. Reason : Because charge ha discrete nature and the current supplied by the battery in the circuit comes at the expense of chemical energy stored in it.