Bredhurst Receiving and Transmitting Society |
Practical 4. |
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Measure potential differences and currents in a simple circuit.
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More use of the multi-meter. The circuit will have been made up on a board ( or you may be using the construction you made earlier) and you will probably have to un-solder joints of the linking wires between the components, selecting which wire connection to remove and how to replace it by the multimeter's probes. Measuing the current flow For this assignment you will need to know that you can break the circuit at any point to take the current reading on a multi-meter. The diagram points out only one such place that it can be broken but you could even measure the current across the switch with the switch open as that too breaks the track !!
Measuring Voltage to measure the voltage you have to measure across somthing where a load is modifing the potential thus it is no good measurng acroos the switch as what flows in also flows out and there is no change. Change occurs across a resistor, LED diode, lamp as these are all load of different sorts.
Else where in the course you can read in more detail but these two diagrams should be a memory jogger if you have already been through the course.
Or of course you can use the circuit with the lamp from Practical no. 4
then you would measure the volts across the lamp and then break the wire link between the switch and the lamp to read the current.
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