year 7: electricity - voltage, current & resistance
Post on 04-May-2022
7 Views
Preview:
TRANSCRIPT
Year 7: Electricity - Voltage, Current & Resistance
Key word definition
electron A negative particle in the atom
Proton A positive particle in the atom
Neutron A neutral particle in the atom
Circuit symbol
A symbol to represent an electrical device
Ammeter A device for measuring Current
Voltmeter A device for measuring potential difference
Volts Unit for potential difference (V)
Amps Unit for current (A)
ohms Unit for resistance (W)
There are two types of charge.Positive (Proton) & Negative (Electron)Like charges repelUnlike charges attract.
Question: A bulb has a current of 4A and a potential difference of 6V, what is resistance?
An Insulator can be charged by rubbing (Friction)
The flow of charge is called electric current. It can be measured using an Ammeter. It is always in series.
A cell or battery can push chargesalong, we call this push potential difference. It can be measured using a Voltmeter. It is always in parallel.
π ππ πππ‘πππ (Ξ©)=πππ‘πππππ ππππππππππ π
πΆπ’πππππ‘ π΄
The resistance of a piece of material can be changed by:β’ Changing its lengthβ’ Changing its thicknessβ’ Changing the material
The resistance of the material increases linearly with length.
top related