**Current, Voltage **and** Resistance** are typical terms that are offered to describe electricity in circuits.

You are watching: What makes a light bulb non ohmic

Current is the lot of fee that passes with a allude in a conductor every second. The symbol for current is I and also the unit is amps (A).

Voltage (potential difference) is the work done to move a charge versus an electrical field in between two points. The symbol because that voltage is V and also the unit for voltage is volts (V)

Resistance is a measure of how piersonforcongress.complicated it is for existing to circulation through a material. The symbol for resistance is R and resistance is measure in ohms (Ω). There space several factors that effect the resistance of a conductor:

Length – If the material has a much longer length, this will an outpiersonforcongress.come in a greater number the collisions with various other ions in ~ the conductor, raising the resistance and also making it harder for the existing to flow.Cross-sectional area – With a large cross-sectional area, over there is less chance the collisions and also the resistance will decrease.Temperature – greater temperatures will result in an boosted vibration of the ions, make the possibilities of electron colliding higher and the resistance will increase.**Ohm’s Law:**

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

where:

= the voltage (in V)

= the present (in A)

= the resistance (in Ω).

**Ohmic and also non-ohmic resistors:**

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

See more: Land Between Two Rivers Is Called A Doab B Bhabar Class 11 Social Science Cbse

Ohmic and also non-ohmic conductors can be discover by plotting a graph of present vs voltage. The graph for an ohmic conductor is a straight line. The resistance can be found from the gradient that the graph. The existing vs voltage graph for a non-ohmic conductor is not a directly line.

**Example 1:**

What voltage will flow through a wire through a resistance of 1.5Ω to produce a present of 4A?

**Answer:**

Using

where:

= 4A

= 1.5Ω

= 6V

**Example 2:**

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