Book+2+2.6

VI. Electrical Safety A. Wires carry electric current from the electric plant to the customer 1. Potential dangers i. short circuits ii. electric shocks iii. underground wires B. Short circuit-a connection that allows current to take path of least resistance 1. current can be very high i. can be fatal C. Electric Shocks 1. if your body receives an electric current from an outside source - the shock can interfere with your body's electrical signal i. severity of shock depends on current a) .01A or less is almost unoticable b) .2 A or greater - burn, stop the heart D. Grounding - a circuit is grounded when charges are able to flow directly the circuit into circuit Earth to avoid short circuits 1. Third Prong - round, connects any metal pieces of the appliance to the groundwire of the building 2. Electric charge will flow directly into Earth 3. Provides an alternate path for electric current E. Breaking a circuit 1. fuse and circuit breakers are added to circuits to prevent circuits from overheating devices 2. Fuse - device that contains a thin strip of metal that will melt if there is too much current thru it i. Metal blows or melts - it breaks the circuit ii. once burns out - has to replace it 3. Circuit Breaker - reusable safety switch that breaks the circuit when the current gets too high i. flip the switch to reset

Study Guide 2. the ground 14. short circuit 15. circuit breaker 20. false - fuse

Quiz 2.6 1. contains a thin metal strip that will melt if too much current is thru it. when it goes - circuit is broken 2. Prevents fires, protects devices from damage from high current 3. A high current can cause sm metal band to heat up and bend away from wires in circuit and disrupt current 4. Prevents fires and protects devices from damage caused by high current 5. Electrical signals in the human body control breathing, heartbeat and muscle movement. An electric shock form the outside can interfere with the body's electrical signal 6. grounded 7. fuse 8. third prong 9. short circuit 10. circuit breaker