Electricity 4 - using a V divider to turn on a transistor

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1) It takes a minimum voltage to turn on a transistor. What voltage does this transistor require?

2 points

0,5 V for the transistor and 1,5 V for the LED

2 V for the transistor alone

3 V

5 V

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2) The voltage required to turn on the base of the transistor is taken from a voltage divider. A voltage divider is...

2 points

a series of cells

a series of resistors

a series of wires

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3) The closer up to the 6V side (top) of the voltage divider we take our current to the base, the ...

2 points

dimmer the LED glows

brighter the LED glows

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4) If we have 6V divided by four resistors in series, each resistor drops the voltage by...

2 points

1,5

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5) 2,4V applied to the base...

2 points

would not turn on the transistor

would only just turn on the transistor

would turn the transistor on fully

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6) All the black wires at the bottom joining both circuits are attached to the batteries ...

2 points

positive side or long stroke

negative side or long stroke

negative side or short stroke

positive side or short stroke

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7) Resistors in series are ... dividers.

2 points

curent

voltage

ohm

Option 3

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8) To divide voltage means each resistor chops off a piece of the total voltage...

2 points

and so each resistor drops the voltage a little more from the maximum

and so each resistor adds a bit of voltage up to the maximum

and so each resistor is very good at maths

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9) Placing our voltage probe halfway between the voltage dividers in this 6V circuit, gives us ... volts

2 points

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10) Using wet fingers to the base instead of a wire, causes...

2 points

the LED to glow more brightly because water is a good conductor

the LED to glow more dimly because water is a good conductor

the LED to glow more dimly because water is a poor conductor

the LED to go out, because water is not a conductor

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