Is this testing device considered to be 'Contact' or 'Non-Contact'?

Analogue meters with a moving iron meter movement would have:

Is this Clamp/Tong meter considered to be 'Contact' or 'Non-Contact'?

Clamp / Tong testers used for measuring current:

What is the minimum Cat rating for meters used at point E, the socket outlet?

An analogue meter movement classified as a dynamometer, is used to measure:

What is this device?

What is this device?

What is this device?

The magnetomotive force in a relay or contactor is produced by the:

Contactors have similar construction to relays, but are usually designed to:

A blowout coil is often used on DC contactors to assist with:

When using 'Fleming’s Right Hand Rule for Generators', the pointer finger indicates:

Which of the following devices rely on the principle of electromagnetic induction for their operation?

What is the symbol for an air core inductor

This symbol is for what type of inductor?

This symbol is for what type of inductor?

This is the symbol for a Variable inductor

This is the symbol for a Tapped inductor

If a voltage is applied to a coil, an EMF is induced in the coil that opposes the applied EMF. This is due to:

What do ammeters use to allow them to measure high currents?

What is the minimum Category Rating for a multimeter used to test the voltage of the incoming supply to a switchboard of a domestic installation?

Which meter would be most suitable to measure current without interrupting the circuit?

When a voltage is applied to a coil, an EMF is induced in the coil that opposes the applied EMF. This is due to:

When a change in current in a conductor induces an EMF in a conductor next to it, this is called:

Power cables installed in close proximity to telecommunications cables can cause _____________ due to mutual inductance.

Using Fleming's right-hand rule, determine the direction of the induced EMF?

Four factors that determine the inductance of a coil are the:

1. number of turns

2. length of the coil

3.

4.

Inductance can be defined as:

A bifilar wound coil has:

Iron core inductors are often used in:

The ferrite core inductor shown in the drawing is mainly used in:

Increasing the number of turns in an inductor causes the inductance to:

Decreasing the amount of iron in the core of an inductor causes the inductance to:

To minimise loading effects, digital multimeters (DMMs) have input resistances/Impedances of about _________ when selected to measure voltage.

Sensing devices are buried in the road surface to detect vehicles at traffic lights and are known as:

Hall effect sensors are used in instruments and meters to measure:

Magnetostriction causes materials to:

D C motors convert mechanical energy to electrical energy.

In the drawing shown, B is:

In the drawing shown, D is:

Digital multimeters with very high Input resistances/impedances can:

 $\tau=\frac{L}{R}$  The R L circuit shown has the following values;

R = 200Ω, L = 1H, Supply =100V DC

Calculate the time for the current to reach maximum.

 $\tau=\frac{L}{R}$  The R L circuit shown has the following values;

R = 200Ω, L = 1H, Supply =100V DC

Calculate the current in the circuit after 1 time constant.

The R L circuit shown has the following values;

R = 200Ω, L = 1H, Supply =100V DC

Calculate the current in the circuit after 5 time constants.

The R L circuit shown has the following values:

R = 200Ω, L = 1H, Supply =100V DC

Calculate the voltage across the inductor after 

1 time constant.

 $V_{Rse}=V_T\ -V_{fsd}$  

The meter in the drawing shown has a resistor added in series to increase the voltage range.

Its details are as follows:

FSD = 1mA, R = 100Ω, and New voltage range = 30V

Calculate the voltage across the series resistor when 30V is applied to the whole meter circuit.

 $V_{fsd}=I_{fsd}\ \times R_m$  

The meter in the drawing shown has a shunt resistor connected in parallel to increase the current range.

The details are as follows:

FSD = 5mA, Rm = 10Ω, and New current range = 10A

Calculate the full scale deflection voltage of the meter movement.

 $I_{sh}=I_T\ -I_{fsd}$  

The meter in the drawing shown has a shunt resistor connected in parallel to increase the current range.

The details are as follows:
FSD = 5mA, Rm = 10Ω, and New current range = 10A
Calculate the current flowing in the shunt when the meter is reading the full scale value of 10A.

 $R_{sh}=\frac{V_{sh}}{I_{sh}}\$  

The meter in the drawing shown has a shunt resistor connected in parallel to increase the current range.

The details are as follows:
FSD = 5mA, Rm = 10Ω, and New current range = 10A
Calculate the resistance of the shunt to enable the meter read a full scale value of 10A.

 $R_{se}=\frac{V_{Rse}}{I_{fsd}}$  

The meter in the drawing shown has a resistor added in series to increase the voltage range.

Its details are as follows:

FSD = 1mA, R = 100Ω, and New voltage range = 30V

Calculate the resistance of the series resistor required to increase the range of the meter to 30V.