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Science > Electrical Circuits > Flashcards

Electrical Circuits Flashcards

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1
Q

What are particles that carry an electric charge called

A

Electrons

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2
Q

What is an electric current

A

A flow of charge

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3
Q

What two things are needed for an electric current to flow

A
  1. Something to transfer the energy to the electrons such as a battery
  2. A complete path for the electrons to flow through (a circuit)
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4
Q

What does a switch do in an electric circuit

A

It breaks the circuit and let’s it be turned on and off

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5
Q

What should you do when drawing a circuit diagram

A

Draw circuit symbols first then draw the wires. Do not let the wires cross each other

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6
Q

What is current a measure of

A

How much electric charge flows through a circuit

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7
Q

What is current measured in

A

Amperes (A) It is often shortened to Amp

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8
Q

What device is used to measure current

A

Ammeter

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9
Q

How do you get a reading on an ammeter

A

By connecting it with the circuit

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10
Q

What is potential difference the measure of

A

The difference in energy between two parts of a circuit. The bigger the difference in energy the bigger the potential difference

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11
Q

What is potential difference measured in

A

Volts

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12
Q

What device is used to measure potential difference

A

Voltmeter

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13
Q

What happens in a series circuit if a lamp breaks or a component is disconnected

A

Everything stops working

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14
Q

Why would a series circuit be useful

A

If you want a warning that one component has failed. It also needs less wiring

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15
Q

How does adding more cells to a circuit effect it

A

It increases the current

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16
Q

Why would a parallel circuit be useful

A

Because if one component stops working all the others on different branches carry on. Also the lights don’t dim if you add more they will stay the same

17
Q

What is resistance

A

How much the wires and other components in a circuit reduce the flow of charge through them

18
Q

What is resistance measured in

A

Ohms (symbol is an uppercase Greek letter omega)

19
Q

When does the resistance increase

A

When you add more components to a circuit

20
Q

How do you calculate the resistance

A

By measuring:
The potential difference
The current
And dividing TPD by TC

21
Q

Conductors of electricity

A

Metal elements
Graphite
Mixtures of metals
Salt solution

22
Q

Insulators of electricity

A 
Most non metals
Diamond
Plastic
Wood
Rock

Science (13 decks)

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