Flashcards in 10 Deck (41)

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1

## What is a thing called which doesn’t carry a electrical current through it?

### An insulator.

2

## What is a thing called which electrical currents can flow through?

### Conductor.

3

## What is the sign for a ammeter?

### A circle with an A in it.

4

## What is the sign for a voltage metre?

### A circle with a V in it.

5

## What is the sign for a filament lamp?

### A circle with a X in it.

6

## What is the sign for a motor?

### A circle with a M in it.

7

## What is the sign of a resistor?

### A oblong.

8

## What is the sign of a variable resistor?

### A oblong with a arrow crossing through it, (bottom left to top right)

9

## What is the sign for a thermistor?

### A oblong with a bendy line going through it (bottom left to top right.)

10

## What is the sign for light dependent resistor?

### A oblong with a circle round it.

11

## What is the sign for a diode?

### A circle with a triangle in it (triangle like a ‘not’ logic gate)

12

## What is the sign for an LED.

### Same as diode ( circle with a triangle in it) with 2 arrows going out of it, in the top right direction.

13

## What is a series circuit like?

### One single loop with all components on one circuit.

14

## What is a parallel circuit like?

### Many different circuits in one loop.

15

## Ads and disads of series circuit?

###
- the more bulbs the lower brightness. As all bulbs share the amps.

- one single point of Failure.

16

## Ads and disads of parallel circuit:

###
- if one loop failed then others can still work.

- all stay as bright as each other.

- but drains battery and is therefore costly.

17

## What 3 thing must circuits have?

###
- battery

- components

- wires.

18

## What is electrical current?

###
- known as letter ‘i’

- its the rate of flow of charge.

- or charge per second.

- measured in amps (A)

19

## What is potential difference?

###
- voltage

- its energy per unit of charge.

- measured in volts (V)

20

## What is Kirchhoff’s first law?

### The total energy entering a junction is equal to the energy leaving the junction.

21

## What is electrical resistance?

### An opposition to the flow of the circuit.

22

## Current =

###
Charge / time.

Or

,i = Q/T

23

## Potential difference=

###
Energy / charge.

Or

V= E/Q

24

## What is one volt?

### 1 joule per coulomb.

25

## What is resistance measured in?

### Ohms, (omega sign)

26

## The higher the resistance?

### The lower the current.

27

## How does resistance occur?

### When positive ions block and hit into moving electrons stopping the flow of current.

28

## The hotter the wire?

### The more resistance.

29

## Resistor on a (current-voltage) graph?

### A directionally proportion graph, through origin.

30