V=IR Equation & I-V Graphs

This lesson covers:

  1. The relationship between voltage, current, and resistance: V=IRV=IR
  2. The current / voltage graphs for resistors, filament lamps, and diodes

The formula which relates voltage, current, and resistance is:

V=IRV=\frac{I}{R}

V=RIV=\frac{R}{I}

V=IRV=IR

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1

A 12 Ω resistor has 2 A of current passing through it.


What is the potential difference across the resistor?

24

V

V

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1

Graph showing a linear relationship between current and voltage.

The above diagram is a current / voltage graph for a:

Fixed Resistor

Filament lamp

Diode

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16 V is supplied across a resistor that has 2 A of current flowing through it.


What is the resistance of the resistor?

8

Ω

Ω

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For wires and resistors, increasing the temperature will __________ the resistance.

decrease

increase

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Current voltage graph showing the relationship between current and voltage with a non-linear curve.

The above diagram is a current / voltage graph for a:

Filament lamp

Diode

Resistor

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/

1

Diodes:

Supply power to a circuit

Measure the current in a circuit

Switch circuits on and off

Only allow current to flow one way around a circuit

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Graph showing a current voltage relationship with an increasing curve.

The above diagram is a current / voltage graph for a:

Resistor

Filament lamp

Diode

0

/

1