Basic Circuit Testing
Voltmeter testing.
When testing for voltage we connect a voltmeter to
the positive and negative post of the battery, we
should read 12.6 volts.
Figure 19
Figure 20
Figure 21
If we connect our voltmeter to the negative post of
the battery and to any point up to the switch, we will
still measure 12.6 volts. All we are measuring is the
voltage available up to the switch. (See fig 20.)
Connecting the voltmeter across the load with the
switch open will show a voltage reading of 0.0
volts. Without the switch closed, (no current flowing
in the circuit) there is no voltage difference across
the load.
When we close the switch, current flows in the
circuit. We will then read a voltage drop (pressure
difference) across our load. There must be current
flowing in the circuit to measure the voltage
difference across the load.
Figure 22
9
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