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The Basics of Electricity

The Basics of Electricity. Current and Voltage An electric current is the movement of electrons ( negative charges ). Current is measured in units called Amps ( A ). In a conductor ( all metals, carbon ) the electrons are free to move .

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The Basics of Electricity

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  1. The Basics of Electricity Current and Voltage An electriccurrent is the movement ofelectrons ( negative charges ). Current is measured in unitscalled Amps ( A ). In a conductor ( all metals, carbon ) the electronsare free to move. If the conductor is connected to a voltage supply ( mains, battery ) the electrons are given theenergythey need to move. Voltage is measured in units called Volts ( V ).

  2. electrical kinetic electrical heat electrical light electrical sound Appliances The mainsand a battery supply electrical energy. Appliances change this electrical energy to another form. Some typical main energy changes that take place in everyday appliances: AplicaciónEnergy Change Kettle Lamp Radio Food Mixer

  3. Power The Powerof an appliance tells us how quickly it uses up electrical energy. Power is measured inunits called Watts ( W ). High Power appliances need a bigger electric current.

  4. Fuses Every appliance has a fuse ( usually found in its plug ). The fuse protects the flex connecting the appliance from overheating. If too large a current flows through the flex the fuse melts. The gap created means no current can flow and the appliance is safe. Appliances usually need a 3 A or a 13 A fuse. These are the maximum currents that can flow before the fuse melts.

  5. AppliancePower (W)Fuse (A)

  6. What energy do appliances with the biggest Powers produce? What size of fuse do appliances with a Power greater than 700 W need? What about appliances with a Power less than 700 W? What appliances are exceptions to this rule? Why do these appliances require a bigger fuse? Heat Energy appliances have the biggest Powers Power more than or equal to 700 W needs a 13 A fuse Power less than 700 W needs a 3 A fuse Fridge and a hoover are exceptions They both have an electric motor

  7. Choosing a Fuse Appliances with a power rating up to 700 W: use a 3A fuse Appliances with a power rating greater than 700 W: use a 13 A fuse

  8. Flexes A flex connects an appliance to a plug. Appliances with a bigger power require a thicker flex.

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