Ammeter, instrument for measuring either direct or alternating electric current, in amperes. An ammeter can measure a wide range of current values because at high values only a small portion of the current is directed through the meter mechanism; a shunt in parallel with the meter carries the major portion.
How do you calculate an ammeter reading?
V=IR, here V is the potential difference across a resistance R through which a current I is flowing. The ammeter is connected in series with the circuit. So its reading will show the value of the current flowing in the circuit. Hence, the reading of the ammeter is equal to 1A.
What is the resistance of an ideal ammeter?
zero An ideal ammeter is an ammeter whose resistance is zero thus giving the user zero error in measurement. Practically there is no such conductor whose resistance is zero.
Why is an ammeter used?
An ammeter (abbreviation of Ampere meter) is a measuring instrument used to measure the current in a circuit. Electric currents are measured in Amperes (A), hence the name. Instruments used to measure smaller currents, in the milliampere or microampere range, are designated as milliammeters or microammeters.
What is the reading of ammeter as shown in the circuit diagram?
Hint: An ammeter is an instrument that is commonly used to measure the current in a given circuit. The reading shown by the ammeter is always the same reading that the total amount of current is passing through that segment.
What will happen if we connect an ammeter in parallel?
Ammeter aims at measuring the current flowing through the circuit and hence, it is connected in series. When ammeter is connected in parallel to the circuit, net resistance of the circuit decreases. Hence more current is drawn from the battery, which damages the ammeter.