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circuit continuity. High current flow
indicates a short circuit, unintentional
ground or a defective component. Some
type of defect has lowered the circuit
resistance. Low current flow may
indicate high resistance or a poor
connection in the circuit or a discharged
battery. No current indicates an open
circuit or loss of power. OHMMETERS—
ANALOG AND DIGITAL
An ohmmeter is powered by an internal
battery that applies a small voltage to a
circuit or component and measures how
much current flows through the circuit
or component. It then displays the result
as resistance. Ohmmeters are used for Ammeters must always be connected in
series with the circuit, never in parallel.
That is, all the circuit current must flow
through the meter. It is connected by
attaching the positive lead to the positive
or battery side of the circuit, and the
negative lead to negative or ground side of
the circuit, as shown.
C AUTION: These meters have extremely low
internal resistance. If connected in parallel, the
current running through the parallel branch
created by the meter might be high enough to
damage the meter along with the circuit the...
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