Electrical Faults Open Circuit

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Presentation transcript:

Electrical Faults Open Circuit Current cannot flow as there is a gap in the circuit. The lamp is off. Open circuit faults have a higher resistance than expected. break in wire No Fault Open Circuit

Short Circuit Current flows from one wire to the other not reaching the lamp. The lamp is off. Short circuit faults have a lower resistance than expected. Electrical current will always try and follow the path of least resistance. wires touching No Fault Short Circuit

The Continuity Tester The continuity tester is a circuit that is used to detect open circuit faults. If the wire is ok the circuit is complete and the lamp lights. If there is an open circuit fault there is a gap in the circuit and the lamp is off.

Extension Leads Extension blocks are connected in parallel. Care must be taken when using an extension block to connect appliances to a socket. The more appliances connected in parallel the bigger the current flowing through the flex to the extension block. 5 A 2 A 3 A ?? A to socket This could cause the flex to overheat.