electrotechnology - dc circuits: (01)the basics

Electrotechnology - DC Circuits: (01)The Basics

What have we actually seen?

• What metal are most cables and wires made from?

• What units are used to measure the difference in charge

between two points?

• Is the voltage across the terminals of a battery exactly

equal to the voltage printed on it?

• What is meant by the bands of colour on a resistor?

• What is produced when electric current flows through a

resistor?

Activity 1

Print this page and draw, in red pen, the path that the current must have taken to complete the circuit.

Activity 2

Find the “Resistor Colour Code” on the Internet and print it out.Use it to work out the resistance of the resistor in the experiment.

Activity 3

Reconnect the circuit and watch what happens to the battery voltage over a period of time.Explain your observations.

Activity 4

Disconnect the resistor and then test the terminal voltage again. This is the open-circuit voltage or no-load voltage.Note any changes.

Finish

electrotechnology - dc circuits: (01)the basics

battery voltage

noload voltage

terminal voltage

opencircuit voltage

resistor colour code

bands of colour

electric current flows

red pen

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