Circuit Isolation

How should you store electrical test instruments?

• They are very robust, so no specific storage requirements are needed.

• Store then with dangerous substances.

• Store test instruments carefully so they don't get knocked around or damaged.

• Chuck them in your bag as they are very robust and will be alright.

Which of the following best describes Prove-Test-Prove?

• Process of proving your meter on a known isolated supply, testing the circuit for isolation and then re-proving your meter on a known live supply

• Process of proving your meter on a known live supply, testing the circuit for isolation and then re-proving your meter on an isolated live supply

• Process of proving your meter on a known live supply, testing the circuit for isolation and then re-proving your meter on the known live supply

• Process of proving your meter on a known isolated supply, testing the circuit for isolation and then re-proving your meter on an isolated live supply

Which three values can be measured by a multimeter?

• Resistance, Lux, Voltage

• Current, Past, Future

• Voltage, Current, Resistance

• Voltage, Potential Difference, EMF

Which of the following best describes DC?

• Current flow that is continuous

• The energy used in a circuit

• The pressure driving electricity around a circuit

• Current flow that alternates

Which of the following best describes analogue and digital meter displays?

• Both use a pointer that physically moves to display the value being measured

• A digital display uses a pointer that moves, and an analogue uses a screen (often LCD) to display the value being measured

• Both use a screen(often LCD) to display the value being measured

• An Analogue meter uses a pointer that moves, & a digital meter uses a screen (LCD) to display the value being measured

What is the purpose of the mirror on an analogue meter?

• To help you position your eye in the right place to get an accurate reading

• To help you see the back of the needle to get a more accurate reading

• To help you see the movement of the needle and get a more accurate reading

• To help you see that there are no obstructions behind the needle that could affect the reading

What is shown in the picture?

• Multi-meter displaying DC voltage

• Multi-meter displaying low resistance

• A non-contact voltage detector

• A multi-meter displaying AC voltage

When using a multimeter to test voltage - In which order should the tasks be carried out?

A. Carry out functional checks

B. Check the condition of the meter and the leads

C. Choose the voltage type and meter range (if not auto-ranging)

D. Take the reading

E. Install the leads

• B – A – D – E – C

• B – E – C – A – D

• B – E – D – C – A

• B – A – E – C - D

Which of the following best describes Resistance?

• The flow of electrons in a circuit

• The pressure driving electricity around a circuit

• The opposition to electron flow

• The energy used in a circuit

What does it tell you if the display on a multi-meter (set to Ohms scale) turns from OL to a low ohm reading when the leads are touched together?

• One of the leads is faulty

• Both leads are faulty

• The leads are in working order

• The meter is faulty