electricity basics

electric current

flow of charges

conventional current

charges flow from positive to negative terminal

electron flow

charges flow from negative to positive terminal

coulomb (C)

unit of charge

ampere (A)

unit of current

ohm (Ω)

unit of resistance

volt (V)

unit of voltage

potential difference

Energy transferred or Work done per unit of charge

voltage

potential difference

resistance

Measure of how much an object opposes the passage of electrons.

Ohm's Law

For a given conductor, the Current flowing through it is directly proportional to the Potential Difference (Voltage) across it.

resistor

Device design to have a specific resistance

circuit diagram

Graphical representation of an electric circuit.

voltmeter

device to measure voltage

ammeter

device to measure current

series circuit

circuit where current has only one path to flow through

parallel circuit

circuit where current has several paths to flow through

short circuit

a low resistance connection between the two conductors supplying electrical power to any circuit. This results in excessive current flow in the power source through the 'short,' and may even cause the power source to be destroyed

I

symbol for current

R

symbol for resistance

V

symbol for voltage/symbol for Volt

joule (J)

unit of energy

watt (W)

unit of power

Q =

I x t

V =

E/Q or W/Q

R =

V/I