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Electricity PowerPoint PPT Presentation


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Electricity. Current Voltage Resistance Current, Voltage, Resistance characteristics AC DC Plugs Earth Fuses Power. Current. Current is the amount of charge flowing past a point in a given time Current (A) = Charge (C) / time (s) Current read by an ammeter – connected in series.

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Electricity

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Electricity

Current

Voltage

Resistance

Current, Voltage, Resistance characteristics

AC DC

Plugs

Earth

Fuses

Power


Current

  • Current is the amount of charge flowing past a point in a given time

    Current (A) = Charge (C) / time (s)

    Current read by an ammeter –

    connected in series


Potential Difference

  • Voltage

  • Potential difference is the energy given to or given by a charge when it passes a component.

    PD (V) = Energy (J) / Charge (C)

    PD is taken by a voltmeter and is connected in parallel with the component.


Resistance

  • Resistance is the volts per amp for a component.

  • How many volts are needed to push a current of so many through a component.

    Resistance (Ohms) = PD (V)/ Current (A)


  • Circuit models

  • Circuit diagrams

  • Resistor models


IV Characteristics

  • Resistor

  • Bulb

  • Diode


Resistors

  • Thermistor

  • LDR


  • review


Mains Elec

  • PHET

  • AC DC

  • Period and frequency


Plugs


Fuse

  • A Fuse is a piece of wire with a low melting point

  • If there is a fault in the electrical appliance and the current goes up it could damage the wiring in the appliance

  • But if a fuse is installed, this will melt (or “blow”) and break the circuit

  • So a fuse is used to protect the appliance – not necessarily to protect us from electric shock


Earth

  • What on Earth does it do?

  • V d G


Earth

  • No Earth – No Fault


Earth

  • No Earth - Fault


Earth

  • Earth – no Fault


Earth

  • Earth - Fault


Power

  • Power = work done / time taken

  • Lifting stuff


Electrical Power

  • Electrical power is the electrical work done in a given time.

    Power (W) = current (A) x voltage (V)


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