Flashcards in Current, Potential Difference And Resistance Deck (20)

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0

## What is current

### Rate of flow of charge

1

## Give an example do current in a wire

###
Like WATER flowing in a PIPE

The amount of water that flows depends on the flow rate and the time

2

## What is the equation linking current to charge and time

### I=Q/T

3

## What direction does conventional current flow

###
From + to -

The OPPOSITE way from ELECTRON flow

4

## What is one coulomb defined as

### The amount of CHARGE that passes in 1 SECONDS when the CURRENT is 1 amperes

5

## What is the potential difference defined as

### Energy converted per unit charge moved

6

## To make electric charge flow through a conductor what do you need to do on it

### Work

7

## What is the pd in the water analogy

### The pressure that's forcing water along the pipe

8

## What is the equation linking voltage to energy and charge

### V=W/Q

9

## When is the potential difference across a component 1 volt

### When you convert 1 joule of energy moving 1 coulomb of charge through the component

10

## How much current you get for a particular pd depends on heat

### The resistance of the component

11

## What can you think of a components resistance as

### A measure of how DIFFICULT it is to get a CURRENT to FLOW through it

12

## What is the equation which links resistance to voltage and current

### R=V/I

13

## When does a component have a distance of 1

### If it's pd of 1V makes a current of 1A flow through it

14

## For an ohmic conductor what is constant

### The resistance

15

## What is ohm's law

### Provided the TEMPERATURE is constant, the CURRENT through an ohmic conductor is DIRECTLY proportional to the PD across it

16

## What are the conductors which obey ohms law called

### Ohmic conductors (mostly metals)

17

## What does the graph of an ohmic conductor show when you plot voltage against current

###
Straight line (origin)

Double pd double current- directly proportional

Resistance constant - gradient always fixed

18

## What will have a significant effect on resistance (resistivity changes)

###
Light level

Temperature

19