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Transcript
Current – Voltage Graphs Aims (a) define resistance; (b) select and use the equation for resistance (c) define the ohm; (d) state and use Ohm’s law; (e) describe an experiment to obtain the I–V characteristics of a resistor at constant temperature, filament lamp and light-emitting diode (LED); Ohms Law • Ohm's law states that the current through a conductor is proportional to the voltage across it provided that the temperature stays constant. R = V/I Definition of the Ohm - The Test Circuit Change the voltage and measure the current A V Results A V Current (A) Voltage (V) Current (A) Voltage (V) Current (A) Voltage (V) The Graph Current Plot all of your results on the same graph and then work out V ÷ I for each one Amps Voltage Volts I V V = 5V V = 10V V = 15V I V V = 5V V = 10V V = 15V I 0.3 A 0.2 A 0.1 A V V = 1V V = 2V V = 3V
