23 VOLT (V) This unit is used to measure electrical pressure. AMPERE (A) This unit is used to measure the amount of current flowing in a circuitEvery appliance connected to a circuit will draw a certain amount of current when in operation.VOLT (V) This unit is used to measure electrical pressure.The single phase voltage used in SA for domestic use is 220 Volts
27 Mains switch controls the power supply to the distribution board. Mains switch controls the supply inside the distribution board, to all the different circuit breakers inside the distribution board.
29 This device is used as part of protection for electrical devices. This device is used to break the flow of electricity whenever a circuit is overloaded.This device is used as part of protection for electrical devices.Must be replaced when blown.
47 AC is the abbreviation for alternating current. AC is the electricity supplied to our homes and industryDC is the abbreviation for direct current.DC is the type of electricity supplied by a cell or battery.
51 Can only be used with AC cycle. A transformer consist of coils, using the magnetic field created by the flow of the electricity input on the primary side.It is use to step up (rise) or step down (lower) the supply of electricity on the secondary side.Can only be used with AC cycle.