Testing

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= 1.6 Circuit testing = Application and use of the following when testing circuits:
 * voltmeter
 * ammeter
 * multimeter

= Testing Electronic Circuits = Electricity can not be seen, only its effects witnessed. This makes a study of electronics difficult unless one has a meter to take readings. For basic testing, it is important to know how to measure the following: 1. Resistance (ohms) 2. Volts (volts) 3. Current (amperes)

= Measuring Resistance (ohms) = 1. When measuring the resistance of a component, turn the rotating switch of the meter to point to the omega sign.

2. Touch the two probes of the meter together and you should get Full Scale Deflection (FSD). If not, hold the probes together and turn the red adjusting wheel to set the reading to 0 ohms.

3. Make sure that the component is always tested out of circuit when measuring resistance.

= Measuring Voltage (volts) = 1. When measuring voltage, the two probes (red and black) must always be placed either side of the component/s being tested, with the black probe (negative lead) of the meter on the 0 volts (bottom rail) side and the red probe towards the positive (top rail) side. You will learn that this is placing the meter in //**PARALLEL**// with the component/s.

= Measuring Current (amps) = 1. When measuring current, it is important to break the circuit and place the two probes of the meter on each wire of the break. Make sure that the red probe is connected to the positive side and the black probe to the negative side. You will learn that the meter is placed in //**SERIES**// with the components. = = = Reference = @http://www.teachersunderground.co.uk/Electronics/Circuit%20Testing.pdf