1.When two bulbs are connected next to each other in a circuit, there to be connected in series. The connected in series. The current flows through the two bulbs in a single path. There are no branches in the circuit.
2.When two bulbs are connected separately to the same terminals of a battery, they are said to be connected in parallel. The current from the battery flows through the two bulbs in two separate paths. There are two branches in the circuit.
3.Andre-Marie Ampere discovered the unit for electric current, which is called ampere. Alesandro Volta discovered the unit for voltage, which is volt. The unit for resistance, ohm is named after German scientist Georg Simon Ohm.
4.Disadvantage of a series circuit
If more bulbs are added to the circuit, the total resistance of the circuit increases. The current that flows in the circuit decreases, thus reducing the brightness of each bulb.
5.Advantage of a parallel circuit
If one of the components fails to work, it does not affect the other components.
6.Difference in term of voltage of a series circuit.
-The voltage across each component is not the same.
-The sum of the voltage across individual components in equal to the voltage across the whole circuit.
-The voltmeter gives a larger reading for components with larger resistance.
7.Electricity is sold in energy unit kilowatt-hour (kWh). The number of kilowatt-hour you use at home is measured by electricity meter.
8.Electricity can be very dangerous if you are not careful while using it. Accidentally touching the live wire can cause electric shocks as well as electrocution to users. A short-circuit due to electrical faults in appliances and the wiring system can cause fire.
9.The following steps are to be taken if a fire occurs due to electrical appliances or wiring system:
-The first rule of dealing with an electrical fire is to turn the current off. If you cannot pull out the plug, turn off the power at the main switch.
10.Once the victim is away from the electric supply, find out if the victim is still breathing. If you are sure that there is no sign of breathing, revive the victim by means of artificial respiration. The easiest method is mouth-to-mouth resuscitation.