Electrical Cicruits Flashcards Preview

Science - Year Seven > Electrical Cicruits > Flashcards

Flashcards in Electrical Cicruits Deck (22)
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1

{two small circles, with a line going up from one of them}

What does this circuit symbol mean?

Switch OFF

2

{a circle with an X in it}

What does this circuit symbol mean?

Light bulb

3

{a circle with a semi circle inside of it}

What does this circuit symbol mean?

Light bulb

4

{a circle with an M in it}

What does this circuit symbol mean?

Motor

5

{A straight bit on top with a semi circle under that}

What does this circuit symbol mean?

Buzzer

6

{two small circles with a line connecting them}

What does this circuit symbol mean?

Switch ON

7

{a thick line not touching the longer thin one parallel to it}

What does this circuit symbol mean?

Cell {two of these together make a battery}

8

{a thick line with a long thinner one parallel to it, and the same again next to that}

What does this circuit symbol mean?

Battery {two cells}

9

{a circle with a V in it}

What does this circuit symbol mean?

Volt meter {measures the volts running through a circuit}

10

How should the wires off the circuit be when you are drawing a circuit?

They should be drawn as straight lines, no curvy corners. Corners should be at a 90* angle wherever possible.

11

What type of energy is in the battery and when it travels into the wires what energy does it then become?

Chemical energy is stored in the battery, and it turns into electrical energy in the wires.

12

How does a fuse work?

A fuse has a wire in it and that wire has a very high resistance, hob if it gets too hot it will eventually melt, destroying the circuit and stopping electricity passing through it. This is to stop fires starting and people getting electrocuted.

13

What is a parallel circuit?

A parallel circuit is a circuit that has more than one path for the current to flow through. The voltage is the same across each component of the parallel circuit. The sum of the currents through each path is equal to the total current that flows from the source.

14

What is a series circuit?

A series circuit is a circuit where there is only one path from the source through all of the loads {loads being a lightbulb, for example} and back to the source. This means that the current in the circuit must flow through all of the loads.

One example of a series circuit is a string of old Christmas lights.

15

In which end of the battery {positive or negative} does the energy come out, and at which end does it go in?

Energy goes out the positive end of the battery and into the negative

16

What is the current and what do we measure it in?

Current is the flow of electrical charge around a circuit.

We measure it in amps, using an ammeter.

17

Is the current the same everywhere in the series circuit?

Yes

18

Is the current in a parallel circuit the same everywhere?

No, the current in the branches adds up to the current in the main circuit

19

What is voltage used for?

Voltage is used to measure the change in energy across two points. It tells you how much energy something uses, for example a light bulb.

20

What is voltage measured in and how can we measure it?

Voltage is measured in volts. You can measure voltage using a volt meter.

21

What happens to a voltage reading and what you are powering if you increase the voltage of a circuit?

The voltage reading will go up to show more volts, and whatever you're powering will increase. (Eg the light in a bulb, the volume of a buzzer, the noise of a fan)

22

{A circle with the letter A in it}

What does this circuit symbol mean?

Ammeter - it measures the amount of current in a circuit