Current, Voltage and Resistance are usual terms the are supplied to explain electricity in circuits.

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Current is the amount of fee that passes through a suggest in a conductor each second. The price for current is I and also the unit is amps (A).

Voltage (potential difference) is the occupational done to move a charge against an electric field in between two points. The symbol for voltage is V and the unit for voltage is volts (V)

Resistance is a measure up of how challenging it is for existing to flow through a material. The symbol because that resistance is R and resistance is measure up in ohms (Ω). There space several starrkingschool.netponents that result the resistance of a conductor:

Length – If the material has a much longer length, this will an outstarrkingschool.nete in a higher number the collisions with various other ions in ~ the conductor, enhancing the resistance and also making that harder because that the current to flow.Cross-sectional area – With a huge cross-sectional area, over there is less chance of collisions and the resistance will certainly decrease.Temperature – greater temperatures will result in an increased vibration the the ions, do the chances of electrons colliding higher and the resistance will certainly increase.

Ohm’s Law:

Ohm’s law explains the relationship in between current, voltage and also resistance:


= the voltage (in V)

= the current (in A)

= the resistance (in Ω).

Ohmic and also non-ohmic resistors:

Ohmic conductors obey Ohm’s law and also have a constant resistance. The resistance the non-ohmic conductors different for different voltages. Irradiate bulbs are an instance of a non-ohmic conductor. The resistance of light bulb increases as the temperature the the filament increases.

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Ohmic and non­-ohmic conductors can be discover by plot a graph of current vs voltage. The graph because that an ohmic conductor is a straight line. The resistance have the right to be uncovered from the gradient that the graph. The existing vs voltage graph because that a non-ohmic conductor is not a directly line.


Example 1:

What voltage will circulation through a wire through a resistance the 1.5Ω to create a present of 4A?




= 4A

= 1.5Ω


= 6V

Example 2:

What is the resistance that a wire that produces a present of 8A when a voltage the 2V is applied?