The movement sensor below is typically used to switch lights on when it gets dark. What component within the device prevents operation during the day?

Which of the following are used in overvoltage protection devices? 

Which of the following are often embedded in the windings of an electric motor to monitor winding temperature? KE7.3

Identify the following fixed resistors by selecting the letter for each beside the description in the table below.

The resistor type most suitable for precision applications where long-term stability is required is the:

The resistor type most suitable for high power applications is the:

Identify the following fixed resistors by selecting the letter for each beside the description in the table below.

Primary cells, secondary cells and fuel cells produce electric current when:

An EMF is produced by a thermocouple by:

A piezoelectric device produces an EMF when exposed to: