JSS3: BASIC SCIENCE - 2ND TERM
Light Energy | Week 12 Topics
Reflection of Light | Week 25 Topics|1 Quiz
Sound Energy | Week 34 Topics
Sound Energy - Echoes, Hearing | Week 42 Topics|1 Quiz
Electrical Energy - Concept of Electrical Flow | Week 52 Topics
Arrangement of Resistors | Week 63 Topics
Electrical Meter Reading and Billing | Week 72 Topics|1 Quiz
Magnetism | Week 82 Topics
Laws of Magnetism | Week 94 Topics|1 Quiz
Radioactivity | Week 105 Topics|1 Quiz
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Functions of Some Circuits of Household Materials
Transmitting and distributing power at low frequency requires the use of several components but the most basic are the following:
The circuit breaker helps in protecting the electrical appliances against earth facet and overload current and it is usually installed at both ends of the transformer terminals.
These devices step up or down voltage which contains internal winding of wires in different sizes depending on the voltage of the capacity.
A fuse is simply a short length of wire of flow melting point connected to the ‘live’ wire of an electric circuit. Its purpose is to automatically open the circuit (cut off current flow) whenever excess current might destroy the wiring or the appliance connected to it.
When a current above a predetermined value flows in the circuit to which a fuse is connected, the heat developed in the fuse wire melts the wire and breaks the circuit; thereby, cutting off further current flow. The fuse thus acts as a safety device, protecting electrical components in the circuit from serious damage, due to excessive current.
The ‘fuse rating’ is the maximum safe current permitted to flow in it before the fuse breaks.