3.3 Internal Resistance

Question 1

What is Internal Resistance

Answer 1

The Resistance inside the battery/cell

Question 2

What is EMF

Answer 2

ElectroMotive Force
The energy supplied to each coulomb of charge passing through the battery.

Question 3

Open Circuit

Answer 3

A Circuit Where No Current Flows

Question 4

Loud Resistance

Answer 4

Resistance due to components outside the battery/Cell

Question 5

Lost Volts

Answer 5

The Energy/Voltage lost in the battery/Cell

Question 6

Equation to find EMF

Answer 6

EMF = t.p.d + Lost Volts
or
E = ꞮR + Ɪr

Question 7

Equation to find Lost Volts

Answer 7

LostVolts = Ɪr
(Resistance and current in the battery/Cell)

Question 8

Symbol For Loud Resistance

Answer 8

R

Question 9

Symbol For Internal Resistance

Answer 9

r

Question 10

What happens when the Load Resistance is Smaller

Answer 10

More Lost Volts
Smaller t.p.d

Question 11

What happens when the Internal Resistance is Larger

Answer 11

More Lost Volts
Smaller t.p.d

Question 12

What happens when the Load Resistance is Larger

Answer 12

Less Lost Volts
Larger t.p.d

Question 13

What happens when Internal Resistance is Smaller

Answer 13

Less Lost Volts
Larger t.p.d

Question 14

What is E/Ɪ

Answer 14

A Constant

Question 15

Short Circuit

Answer 15

Short Circuit is when Load Resistance is Very Low or Zero which means the Current is Large

Question 16

What is EMF measured in

Answer 16

Volts (V)

Question 17

What is the Terminals

Answer 17

The + / - ends of the battery