Electricity Flashcards
What is potential difference
The difference in electrical potential energy per unit charge
What is the emf of a cell
Energy that each coulumb of charge inside the cell/battery can obtain.
It is the amount of energy that enables the cell to allow one coulumb of charge to pass through it.
It is the potential difference of a cell when there is no electric current flowing
Which is bigger between potential difference and emf in a cell
The emf is bigger
What is electric current
The amount of charge that moves past a point in a conductor per second
What is the charge of 1 coulumb
6.25 × 10^18
Why does a voltmeter have high resistance
So it doesn’t affect the total potential difference of the circuit
How do batteries produce current
The chemical energy of the battery is converted to electrical energy
What are the factors that influence the resistance of a conductor
- Type of material
Nichrome has a higher resistance than copper - Length of conductor
The longer the conductor the higher the resistance - Thickness
The thicker the conductor the smaller the resistance - Temperature
The warmer the conductor the higher the resistance
What happens to the total resistance when resistors are added in paralel
The resistance is reduced
