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Electric circuits 4 3.1 e the significance of and the relationship between current, voltage and resistance.

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Presentation on theme: "Electric circuits 4 3.1 e the significance of and the relationship between current, voltage and resistance."— Presentation transcript:

1 Electric circuits 4 3.1 e the significance of and the relationship between current, voltage and resistance.

2 What is resistance? Current particles electrons
Resistance opposition harder Flow friction collision temperature low High ammeter reading

3 Current and voltage If you get a straight line it means that the two quantities current and voltage are proportional. x x Current, I / amps x x x x x x Potential difference / V If you double the voltage then the current doubles. Ohm’s Law: The current flowing through a wire is proportional to the potential difference (voltage) across it provided the temperature remains constant. Georg Ohm 1826

4 V=IR We can express Ohm’s Law mathematically using the equation:
Voltage = Current x Resistance V=IR Voltage measured in Volts (V) Current measured in Amps (A) Resistance measured in Ohms ()

5 V=IR We can express Ohm’s Law mathematically using the equation:
Voltage = Current x Resistance V=IR Voltage measured in Volts (V) Current measured in Amps (A) Resistance measured in Ohms ()

6 Resistance for a bulb If you have a filament bulb and it has a current of 20A running through it, with a potential difference of 100V across it, what is the resistance of the bulb? V = IR R = V/I R = 100V/20A R = 5 

7 Resistors in series Total resistance = R1 + R2
4 2 What is the total resistance for the circuit shown? Total resistance = R1 + R2 Total resistance = 4  + 2  Total resistance = 6 

8 Resistors in series Total resistance = R1 + R2
4 2 What is the total resistance for the circuit shown? Total resistance = R1 + R2 Total resistance = 4  + 2  Total resistance = 6 

9 Simple practice Voltage (V) Current (I) Resistance (Ώ) Formulae 3.0A
4Ώ 6V 12 Ώ 12V 2A 6v 4A 12v 3Ώ

10 Simple practice Voltage (V) Current (I) Resistance (Ώ) Formulae 12.0
4Ώ V= I R 6V 0.5 12 Ω I = V/R 12V 2A 6 Ω R = V/I 6v 4A 1.5 Ω 12v 3Ώ

11 Complete worksheet series circuits.

12 Plenary – Quick Quiz Name these components What are the units of
Voltage Current Resistance Why is better to have gold coated tips on your headphone wires? (key words current and resistance)

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