ELECTRONIC PRINCIPLES QUIZ

A current source has an internal resistance of 100 kW. What is the largest load resistance if the current source must appear stiff?

1 k Ohm

None of these

2 k Ohm

10 k Ohm

20 k Ohm

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Assuming 100% efficiency, what is the power being consumed at the secondary winding of the transformer described in question 91?

None of these

1000 W

20 W

200 W

100 W

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What is the difference between a conductor and an insulator?

The difference between conductors and insulators depends on how they are used

An insulator allows current to flow much easier than a conductor does

An insulator has an excessive number of free electrons, while a conductor has a few free electrons or none at all

None of these

A conductor allows current to flow much easier than an insulator does

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At room temperature a conductor has low many holes?

None of these

Only those produced by thermal energy

less than the free electrons

many

Same number as free electrons

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The Norton current is sometimes called the

Open-load current

Thevenin current

None of these

Shorted-load current

Thevenin voltage

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A transistor has a current gain of 125 and a base current of 30 ÂµA. What is the collector current?

3.75 mA

None of these

3.2 mA

13 mA

0.05 mA

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Which one of the following equations most directly leads to the resistance of an ordinary household light bulb, assuming that you know the power and voltage rating?

I = P/E

P = E2/R

R = E2/P

P = PR

None of these

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Positive ions are atoms that have

Gained a proton

None of these

Lost an electron

Gained an electron

Lost a proton

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What form of energy is used to maintain an imbalance of charges between the terminals of a battery?

Chemical energy

Electronical energy

Solar energy

Mechanical energy

None of these

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What is the barrier potential of a silicon diode at room temperature?

2 m V per degree Celsius

None of these

0.7V

0.3V

1 V

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