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Monday, May 12, 2014

ELECTRICAL CIRCUITS

There are two types of electrical circuit arrangements.
1. Parallel circuits: There is an alternate path to the flow of the current if other paths are blocked.

Note on diagram below: The symbol "R" represents any form of resistance such as bulb resistors, etc. The symbol "E" represents a cell such as battery, a current generator.

2. Series circuit: There is only one path for the current to flow. When this path is blocked, there will be no flow of current.
 
 Animation in a series circuit.

UNITS OF ELECTRICAL QUANTITIES
VariableSymbolUnitSymbol
VoltageVVoltsV
CurrentIAmpereA
Resistance

Power		R

P		Ohm

Watt		Ω

W

Formulas you should know:
1. Voltage = Current x Resistance
2. Power = Voltage x Current

You should be able to use these formulas in calculations.
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