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# Electricity 1

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by

## Harvey Buckle

on 30 October 2017

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#### Transcript of Electricity 1

Aim
To know the differences between:

1. Current
2. Voltage

To use real circuits to show these phenomena

To know symbols of 'resistance' components in a circuit
✳✱
Starter
Electricity travels at the speed of light - more than 186,000 miles per second!
A spark of static electricity can measure up to three thousand (3,000) volts.
A bolt of lightning can measure up to three million (3,000,000) volts, and it lasts less than one second!
Current and voltage
We need to know how to measure the current that flows through a resistor, and how to measure the voltage across the resistor.
Electrical circuits
30th October 2017
Current
A current flows when an electric charge (like an electron in a wire) moves around a circuit. No current can flow if the circuit is broken, for example, when a switch is open.
Voltage
A voltage across an electrical component - such as a lamp - is needed to make a current flow through it. Cells or batteries often provide the voltage needed.
How to measure current
current is measured in amperes
amperes is often abbreviated to amps or A
current flowing through a component in a circuit is measured using an ammeter
the ammeter must be connected in series with the component - remember, in a series circuit, electrical devices are placed one after the other in a continuous line in the circuit between the positive and negative poles of the battery
How to measure voltage
voltage is measured in volts, often abbreviated to V
voltage across a component in a circuit is measured using a voltmeter
the voltmeter must be connected in parallel with the component - remember, in a parallel circuit, the current travels through several paths, through several devices lined up next to each other
What is resistance?
A r_______ is anything that slows down or s___s the flow of c______. An example is a b___ which converts the e_______l energy into h--t and l--t.
Let's set one up
Watch Mr Harvey
Next
Some infernal questions
Symbols
Go to page 356 and draw and label them.
Full transcript