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By Norman R. Scott

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54 Starting Electronics OHMS PER VOLT A meter’s internal resistance is stated as a number of ohms per volt. c. 5 V, it’s resistance is 90 k. 9 V V =  which is roughly what you measured (hopefully). Any difference between the actual measurement and this calculated value may be accounted for because this lower voltage causes a lower multimeter resistance, which in turn affects the voltage, which in turn affects the resistance, and so on until a balance is reached. All of this occurs instantly as soon as the multi­ meter is connected to the circuit.

A digital multimeter, however, will merely give a negative reading. But what is the right way round? And how do you tell the difference? The answers are quite simple really, both given by the fact that your multimeter has two leads: one red, one black. The color coding is used to signify which lead to connect to which point in a circuit. By convention, black is taken to be the color signifying a lower potential. Red, also by convention, signifies a higher potential. So, the multimeter should be connected into the circuit with its red lead touching the point of higher potential and the black lead touching the point of lower potential.

None of these. Chapter 4 Capacitors You need a number of components to build the circuits in this chapter: n n n n n 1  15 k resistor 1  22 μF electrolytic capacitor 1  220 μF electrolytic capacitor 1  470 μF electrolytic capacitor 1  switch. As usual, the resistor power rating and tolerance are of no importance. The capacitor must, however, have a voltage rating of 10 V or more. The switch can be of any type, even an old light switch will do if you have one. A slide switch is ideal, however, both common and cheap.

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