Resistance makes it possible to generate heat control current flow. The Usage of Fuse in the Circuit.
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Resistance can be useful in electrical work.
. An ammeter is used to measure current in amperes. The Wheatstone bridge circuit above is usually operated by adjusting the variable resistor R3until no current flows in the ammeter. Consequently an ammeter will act as a short circuit if placed in parallel across the terminals of a substantial source of voltage.
If this is done a surge in current will result potentially damaging the meter. A microammeter or a milliammeter may be used to measure smaller units of current. If the ammeter is accidently.
Resistance The movement of electrons along a conductor meets with some opposition. Under this special circumstance the above circuit problem may be solved easily without the need for Kirchoffs rules. Notice that resistors R3 and R2 are NOT in parallel because there is a different voltage across each resistor if there is a current in the.
Ammeters are generally protected from excessive current by means of a small fuse located inside the meter housing. This opposition is known as resistance.
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