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IGCSE Physics > Electricity and Electronics > Flashcards

Electricity and Electronics Flashcards

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1
Q

Which equation do we tend to use to compare the power of resistors that are connected in series?

A

P= I^2 R

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2
Q

Which equation do we tend to use to compare the resistors that are connected in parallel?

A

P= V^2/ R

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3
Q

What is direct current?

A

Current flowing in one direction

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4
Q

What is alternating current?

A

Changes direction

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5
Q

What is a variable resistor?

A

It is a controlled resistor and it is used as volume control and as potentiometer- controls the current.

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6
Q

What does a diode do?

A

Allows current to flow in one way only

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7
Q

How should the diode be placed for the circuit to work?

A

The straight line should be on the side of the negative - terminal of the battery

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8
Q

What is diode made to do?

A

Change ac to dc by rectification

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9
Q

What are short circuits?

A

Is a low resistance path for the current to follow

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10
Q

What is the earthing wire used for in our homes?

A

Safety precautions to prevent electric shock

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11
Q

What are dangers of electricity?

A

Damaged insulation
Overheating of cables
Damp conditions since water is a conductor

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12
Q

What is a transducer?

A

A device for converting a non-electrical input into an electrical signal

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13
Q

What does the input sensor do?

A

Detects changes in the environment and converts them to electrical signal

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14
Q

Give examples for input devices

A

Thermistor
LDR
Thermocouple

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15
Q

Give examples for output devices

A

LED’s
Heater
Bell
Loudspeaker

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16
Q

What are analogue signals?

A

Handled information which is represented by continuous change and flow, such as voltage and current

17
Q

What are digital signals?

A

Represent data in discrete units

18
Q

Give the truth table for an OR gate

A

0 1 1
1 0 1
1 1 1
0 0 0

19
Q

Give the truth table for an AND gate

A

0 0 0
0 1 0
1 0 0
1 1 1

20
Q

Give the truth table for a NOT gate

A

0 1

1 0

21
Q

Give the truth table for a NAND gate

A

0 0 1
1 0 1
0 1 1
1 1 0

22
Q

Give the truth table for a NOR gate

A

0 0 1
1 0 0
0 1 0
1 1 0

23
Q

Draw on a piece of paper ALL of the logic gates

A

IGCSE Physics (12 decks)

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