10.7 Resisting the electrons

Question 1

Resistance

Answer 1

Is a measure of how difficult it is for electrons to

move through an object.

Question 2

High resistance

Answer 2

electrons find it hard to pass

through the material.

Question 3

Low resistance

Answer 3

electrons find it easy to pass

through the material.

Question 4

What is resistance measured in

Answer 4

OHMS

Question 5

What instrument is resistance measured with

Answer 5

multimetre

Question 6

Resistors

Answer 6

devices that are deliberately placed in circuits

to control or reduce the size of the current.

Question 7

2 types of resistors

Answer 7

Fixed and variable resistors

Question 8

Fixed resistors

Answer 8

resistors that have fixed resistance

Question 9

Variable resistors

Answer 9

where resistance can be altered (e.g. dial volume on

TV)

Question 10

Voltage drop

Answer 10

when electrons lose energy across a componet

Question 11

what is dependent on resistance

Answer 11

The voltage drop across components

Question 12

What does ohms law state

Answer 12

States the relationship between

current, voltage and resistance

Question 13

What did George ohm discover

Answer 13

voltage drop across a fixed-value
resistor will always be directly proportional to
the current flowing across the resistor.

Question 14

V = IR

Answer 14

ohms law relationship expressed mathemtically

Question 15

symbol for current unit vs symbol for current

Answer 15

A-unit of current

I-current

Question 16

What does Ohm’s Law say about the relationship between electric current in and voltage across metallic conductors?

Answer 16

the electric current is proportional to the voltage drop across it

Question 17

Compare fuse and circuit breaker

Answer 17

A fuse is a wire that burns or melts when current flows too fast whilst a circuit breaker is a switch that breaks the circuit and is activated by higher then normal current.

Fuse interrupts current flow quicker whilst circuit break is reusable