Summary lesson Electricity

Voltage- is the push behind the electrons moving around a closed circuit
Current- is the movement of the electrons around a closed circuit
Resistance- is the ability of materials to resist the motion of the electrons around a closed circuit.
Conductors- allow the flow of electrons to pass through them. Examples are metals (Copper) and graphite (non-metal)

When the slope of a Current/Voltage graph is uniform, we say that the resistance is contant and is OHMIC

When the slope varies, we are dealing with a NON OHMIC resistor

​

Series: there is only 1 pathway for the flow of electrons
-current does not split, voltage does
-the current is the same passing through all elements
-as the load increases, the current passing through the circuit decreases.

Parallel circuits:
-have multiple pathways
-current splits through these pathways
-voltage across all elements is constant
-if one pathway breaks, the circuit can still work

Variable resistors are used to manage current flow
The greater the resistance, the less current can flow through the circuit
We see variable resistors in light dimmers, stoves, volume settings

Fuses are made of conducting wire of different resistance that will burn if too much current is passed through them
Some fuses burn with small currents passing through them- this is usually to protect small appliances
Some fuses allow greater currents to pass through before burning
Fuses MUST be attached in SERIES in the circuit.