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Power Factor

how power cou...

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how power could be same in output and input because if current is changing

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Q. In an ideal step-up transformer input voltage is

110

V and current flowing in the secondary is

10

A, if transformation ratio is

10

, calculate output voltage, current in primary input power and output power.

Q. In a transformer, in practice the output power is always less than the input because of the following power loss:

Q. Draw the typical input and output characteristics of an n-p-n transistor in CE configuration. Show how these characteristics can be used to determine (a) the input resistance

(r_{i})

, and (b) current amplification factor

β

.

Input charcteristics: It is the graph drawn between input current and input voltage when output voltage is kept constant.

Output characteristics : It is the graph drawn between output current and output voltage when input current is kept constant.

(a) Input resitance

(R_{i}

= {[\frac{Change in emitter base voltage (△ V_{B E})}{Change in base current (△ I_{B})}]}_{at constant V_{C E}}

R_{i} = {(\frac{△ V_{B E}}{△ I_{B}})}_{V_{C E}}

(b) Current amplification factor,

(β) = {(\frac{△ I_{C}}{△ I_{B}})}_{V_{C E}}

\frac{△ I_{C}}{△ I_{E} - △ I_{C}}

\frac{\frac{△ I_{C}}{△ I_{E}}}{\frac{△ I_{C}}{△ I_{E}} - \frac{△ I_{C}}{△ I_{E}}}

\frac{α}{1 - α}

\Rightarrow β = \frac{α}{1 - α}

Q. A power transmission line feeds input power at

2300 V

to a step down transformer with its primary windings having

4000

turns, giving the output power at

230 V

. If the current in the primary of the transformer is

5 A

, and its efficiency is

90 %

, the output current would be:

Q. The input and output voltages of a transformer are

220

44

V respectively. Find the current in input circuit if the output current is

2

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