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CBSE Class 12-science Answered

In the given circuit diagram, a voltmeter 'V' is connected across a lamp 'L'. How would (i) the brightness of the lamp and (ii) voltmeter reading 'V' be affected, if the value of resistance 'R' is decreased? Justify your answer.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

Answered by | 04 Jun, 2014, 03:23: PM

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CBSE 12-science - Physics
How do we bias the junctions of a transistor in common emitter configuration?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Physics
What are Transistors?
Asked by Topperlearning User | 23 Jun, 2014, 11:08: AM
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CBSE 12-science - Physics
A P-N transistor is used in common - emitter mode in an amplifier circuit. A change of 40μA in the base current brings a change of 2mA in collector current and 0.04V in base  -emitter  voltage, Find (i) input resistance (ii) current amplification factor β. If a load resistance of 6 k oh m is used, then find voltage gain?
Asked by Topperlearning User | 10 Jul, 2014, 10:25: AM
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CBSE 12-science - Physics
Draw a labeled circuit diagram of a common emitter transistor amplifier. Draw its input and the output characteristics. .
Asked by Topperlearning User | 23 Jun, 2014, 02:16: PM
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CBSE 12-science - Physics
A transistor has a current gain of 30. If the collector resistance is 6kΩ, input resistance is 1kΩ, calculate its voltage gain?
Asked by Topperlearning User | 14 Nov, 2014, 07:38: AM
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CBSE 12-science - Physics
The input resistance of a silicon transistor is Ω Its base current is changed by 15μ A, which results in the change in collector current by 2mA. This transistor is used as a common emitter amplifier with a load resistance of 5k Ω. Calculate current gain (βac) transconductance and voltage gain.
Asked by Topperlearning User | 10 Jul, 2014, 11:09: AM
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CBSE 12-science - Physics
The base of a transistor is lightly doped. Explain why?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Physics
In the given figure, is (i) The emitter (ii) collector forward or reverse biased? Justify.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
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CBSE 12-science - Physics
Define current amplification factor in a common  emitter mode of transistor?
Asked by Topperlearning User | 23 Jun, 2014, 02:11: PM
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CBSE 12-science - Physics
Calculate emitter current for which β = 100 IB = 20μA?
Asked by Topperlearning User | 10 Jul, 2014, 01:13: PM
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