2 CircuitsA circuit is a pathway through which electric current flows. A circuit must be complete to work properly.
3 A circuit must be complete in order to work. Can you tell what is wrong with each of these circuits?This circuit needs awire from the bulb to the negative side of the battery.This wire from the negative end should connect to the other end of the bulb.This circuit needs onewire from the bulb to go to the positive side of the battery.Energy only flows from the positive and negative ends of the battery, not from the side.
4 Electricity Receivers A light bulb is a receiver that produces light.A motor is a receiver that produces motion.
5 ComponentsA D-cell is one component (part) of a circuit. It is the SOURCE of the electricity.
6 SwitchesA switch is used to open and close a circuit.
7 InsulatorsAn insulator is a material that prevents electricity from flowing through the circuit.Some examples of insulators are: plastic, cardboard, magnetite, and wood.
8 ConductorsA conductor is a material that allows electricity to flow through the circuit. (It drives the electricity through the circuit, just like a conductor drives a train!)All metals, including aluminum foil, pennies, and nails, are conductors.
9 Schematic drawingsSchematic drawings are used to represent circuits on a piece of paper.
10 Time for a Quiz! Which of these items are conductors? Penny Paper clip Aluminum foilAll of the aboveNone of the above
11 DAll items made of any type of metal are conductors, including foil, pennies, paper clips, and nails.Items that are not made of metal are insulators!
12 A switch is used to…. A. Open a circuit B. Close a circuit C. Neither A nor BD. Both A and B
13 D Switches are used to open and close circuits. When you turn on a light switch in your house, it closes the circuit so that electricity can be received by the light bulb. When you turn off the switch, the circuit opens and the electricity does not flow to the receiver.
15 NOOne wire needs to touch the SIDE of the bulb to complete the circuit. (Remember, there is a little wire inside the bulb that connects the metal on the side to the bottom, so you need one wire at each point.)
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