Electricity (Early Bird Energy) by Sally M. Walker

By Sally M. Walker

E-book via Walker, Sally M.

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Sample text

34 When you hold your fingers apart, you do not make a complete loop. There is a gap. There is also a gap, or space, in circuits that are not closed. Now spread your thumb and index finger apart. This time, there is a space between your fingers. You cannot trace a complete circle. Your fingers do not make a closed circuit. 35 The foil is not making a complete circuit. The loop does not go all the way from the negative terminal to the positive terminal. Electricity cannot travel through the strip.

You know this because the terminals are warm. That means electrical current is flowing. Current flows only through a closed circuit. 37 To flow, electric current needs a closed circuit. But what makes the current move? Free electrons need a push to get moving. That push comes from electrical force. Electrical force is measured in units called volts. 5 volts. That is enough force to push electrical charges along the foil strip. Look for the word volts or the letter V on your battery. Every battery has a certain number of volts.

It is not a closed circuit. How could you close the circuit? 36 This circuit is complete. It connects the negative and positive terminals with no gaps in between. Electricity can flow through the foil strip. Hold the loose end of the foil strip against the positive terminal. Can you trace along the foil from one terminal to the other without lifting your finger? Yes. You have made a closed circuit. You know this because the terminals are warm. That means electrical current is flowing. Current flows only through a closed circuit.

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