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Electric current An introduction : https://www.youtube.com/watch?v=1xPjES-sHwg.

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Presentation on theme: "Electric current An introduction : https://www.youtube.com/watch?v=1xPjES-sHwg."— Presentation transcript:

1 Electric current An introduction : https://www.youtube.com/watch?v=1xPjES-sHwg

2 Electric current Electric current is an ordered motion of charge carriers between two points having different electric potential ( = voltage). In a metal wire the charge carriers are the conduction electrons, while in a liquid or in a gas they are the ions. There are two fundamental quantities in electricity: current and voltage. Voltage is the cause and current is its effect.

3 We are going to study the current in metals. The conventional direction of the current, for historical reasons, is defined as opposite to the direction of motion of the electrons. http://ed.ted.com/lessons/electric-vocabulary#watch

4 For an electric current to flow, we need two things: 1) something to make the charges flow, such as a battery, a device that is able to maintain a constant voltage between two points (a potential electric difference ), as the water rushes down only if there is a different gravitational potential energy between two points at different height.

5 For an electric current to flow, we need two things: 2) a complete path for the current to flow in. This is called an electric circuit.

6 https://www.youtube.com/watch?v=8gvJzrjwjds

7 How do we define the rate of current? Current is the number of Coulombs that passes a point during a second. We measure it in Amp. So if there is a current of 5 A flowing, it means that 5 C per second are passing a given point.

8 Part1 Charge and current : https://www.youtube.com/watch?v=KUMxSTgLSKM Part 2 Charge and current : https://www.youtube.com/watch?v=MluOUYm8rZA

9 How do we define the voltage? Voltage is the potential difference between two points : it is the potential to do work. It is measured in Volt. So if there is a voltage of 5 V, it means that 1 C has the potential to do 5 J of work.

10 A revision from BBC bitesize http://www.bbc.co.uk/bitesize/ks3/science/ener gy_electricity_forces/electric_current_voltage /activity/

11 A test from BBC Bitesize http://www.bbc.co.uk/bitesize/quiz/q74171589

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