Electric circuits

Electric circuits

1. electric charge

   • insulating materials become electrically charged when are rubbed together
   • A substance that gains electrons becomes negatively charged
     • while a substance that loses electrons becomes positively charged.

2. Attraction & repulsion

   • Two negative charges placed near each other will repel each other, and so will two positive charges.
     • If they have opposite charges they will attract each other.
   • Electrically charged objects can attract small uncharged objects that are close to them

3. Metals

   • Metal atoms release some of their electrons
     • these electrons are free to move through the structure of the metal.
       • This is why metals are good conductors of electricity.

4. Current

   • Strength of an electric current is measured in Amps
     • Amps= Watts / Volts
     • Amps are a measure of how much electric charge is flowing around the circuit

5. Types of circuits

   • Series
     • closed circuit in which the current flows in one path
       • the current through each load is the same & the total voltage across the circuit is the sum of the voltages across each load
   • Parallel
     • circuit is divided into 2 or more paths

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