Electricity Ohm's Law.

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Presentation transcript:

Electricity Ohm's Law

The test Circuit This Circuit is called a test circuit. We can put components in the gap to study or test them. You are going to repeat Ohms experiment.

You change the voltage with the dial on the power pack!! Rheostat set to high resistance Voltage (v) Current (A) 2 4 6 8 Rheostat set to medium resistance Voltage (V Current (A) 2 4 6 8 You change the voltage with the dial on the power pack!! Leave the third column blank for now

using these axes, you can put the high resistance and Medium Resistance. A small voltage gives a big current Current (Amps) Now draw a graph using these axes, you can put the high resistance and medium resistance Results on the same axes High Resistance. A big voltage gives a small current Voltage (Volts)

How does the resistance affect The gradient of the graph? The steeper the gradient the Lower the resistance

Match up the resistances with the pictures… Medium A High B Low C

This is Georg Ohm, he discovered a relationship between voltage and current. Today you are going to follow in his footsteps!

Voltage = Current x Resistance V = I x R Ohms Law Voltage = Current x Resistance Resistance is measured in Ohms, we use the Greek letter omega for this:

now fill in the third column of these tables. Rheostat set to high resistance Voltage (v) Current (A) Resistance (Ω) 2 4 6 8 now fill in the third column of these tables. Use a calculator to help you Rheostat set to medium resistance Voltage (V Current (A) Resistance (Ω) 2 4 6 8

Challenge: - Can you relate Ohms Law to Y=mX, the equation for a line you learned in Maths? Prepare an explanation for the rest of the class?