Practice # 3 Electrical Measuring Instruments

Front

What happens when an analog meter is connected incorrectly in a circuit?

Back

Current reversal can cause a reversed meter deflection and frequently leads to bending of the meter needle.

Front

How should ammeters be connected in a circuit?

Back

Ammeters must be connected in series with the circuit.

Front

Is it acceptable to connect an ammeter across a source of voltage?

Back

Never connect an ammeter across a source of voltage, such as a battery or generator.

Front

What does the pointer of a D'Arsonval meter movement indicate?

Back

The pointer is deflected in proportion to the amount of current through the coil.

Front

What characteristic can be quantified using an oscilloscope?

Back

The oscilloscope allows for the visualization and quantification of various waveform characteristics.

Front

What is the primary function of an ammeter?

Back

An ammeter measures the current flowing through a circuit.

Front

What is the consequence of connecting a voltmeter in series with a circuit?

Back

Connecting a voltmeter in series can lead to incorrect readings and potentially damage the voltmeter.

Front

What is the difference between series and parallel connections in circuits?

Back

In series connections, components are connected end-to-end, while in parallel connections, components are connected across the same voltage source.

Front

What is thermal runaway in electrical circuits?

Back

Thermal runaway occurs when an increase in temperature causes further increases in current, potentially leading to circuit failure.

Front

What is the role of the coil in a D'Arsonval meter?

Back

The coil in a D'Arsonval meter interacts with a magnetic field to produce a deflection proportional to the current.