Current Electricity. Electricity Static Is stationary E.g. Brush your hair Wool socks in tumble drier Current Flows around circuit E.g. turn on light.

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Presentation transcript:

Current Electricity

Electricity Static Is stationary E.g. Brush your hair Wool socks in tumble drier Current Flows around circuit E.g. turn on light Walkman Electricity occurs in 2 different forms

Static Electricity Review Occurs with materials which are insulators Rubbing adds or removes electrons Object becomes charged Like objects repel, unlike attract

Current Electricity Electrons flow through a conductor Negative to positive Circuit = continuous loop for electrons to flow Needs energy supply Energy user

Electrical components Wire Ammeter Battery Fuse Connected wires Bulb Switch Voltmeter Resistor

Series circuit Has a single loop for electrons to travel round Components are connected one after another Current has to travel through all components Current is the same at all points Voltage is shared between components

Parallel circuit Has two or more paths for electrons to flow down Current is shared between the branches Sum of the current in each branch = total current Voltage loss is the same across all components

Electricity Flow of electricity around a circuit is called CURRENT (I) Current measured in amps (A) Voltage (V) – Increase or decrease in the amount of electrical energy carried by the current.

Current (I) Current is the flow of electrons around a circuit Electron flow changes direction 50x per second

Ammeter Measures CURRENT(I) Unit = Amp (A) Current is flow of electrons Connect in series at the point you wish to measure RED to RED and BLACK to BLACK

Voltage (V) Gain or loss of energy as it passes through a component Voltage lost = voltage gained In series voltage loss is shared between components In parallel voltage loss is the same across all components

Voltmeter Measures voltage Unit = Volt (V) Voltage increases as it passes through energy suppliers Voltage is decreased as it passes through users Connect in parallel around a component

SUMMARY In SeriesIn Parallel Current Voltage Always the same The branches share electrons and add to the total Voltage from source = voltage used Voltage is shared between power users Voltage is the same in all branches

Resistance (R) The amount that a component slows the current As the electrons are slowed by a resistor, energy is lost in the form of heat. This means that current, resistance and voltage must be linked. This is Ohms law The unit of resistance is the ohm, symbol  V IR×

Fossil Fuels

Hydro Dam

Hydroelectric power

Nuclear power

Wind Power

Tidal Power

References A Dercho Investigating Science 9 - Pearson