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2.2 Electricity - Coggle Diagram
2.2 Electricity
Electrical Quantities and Conductors
Charge (Q)
Q = I t
E = Q V
Measured in Coulombs
Can only flow if there is a source of Potential Difference
Resistance (R)
Measured in Ohms
How hard it is for current to flow
Current (I)
The rate of flow of charge
V= I R
Measured in Amps
Power (W)
E = P t
Measured in Watts
Rate of energy transfer
P = I^2 R
P = I V
Circuit Arrangements
Direct Current
Current flows in one direction
Series Circuits
Current is
constant
R = R1 + R2
Parallel Circuits
Current is split between branches
Potential Difference across each branch is the same
1/R = 1/R1 +1/ R2
Alternating Current
Direction of current flow continually changes
National Grid
Power Lines
Transports current at very high voltages
Higher voltage reduces energy loss
Step-Down Transformers
Voltage decreases
Used between power lines and houses
Step-Up Transformers
Voltage increases
Used between power stations and power lines