2365 203 #12 - Control Circuits

What is a control circuit used for?

• To power heavy machinery

• To operate and manage systems like lighting or heating automatically

• To improve energy bills

• To replace earth conductors

What is a relay?

• A lighting switch

• A backup battery

• An electrically operated switch

• A type of RCD

What does a sensor do in a control circuit?

• Converts current into resistance

• Detects environmental changes and sends signals

• Stores electricity

• Heats water

What kind of sensor would turn lights on when movement is detected?

• Photocell

• PIR (Passive Infrared) sensor

• Magnetic reed switch

• Humidity sensor

What is the function of a time delay switch?

• Allows circuit operation for a set period before switching off

• Slows down voltage

• Extends cable life

• Increases resistance

Which of the following is a common control device for heating systems?

• Distribution board

• Thermostat

• RCBO

• LED driver

What is an advantage of a programmable control circuit?

• Requires no testing

• Can be customised to respond to different conditions

• Needs no sensors

• Reduces the need for protective devices

What is the role of a contactor in a control circuit?

• Detect light

• Provide backup supply

• Switch higher currents using low-voltage signals

• Store energy for later use

What component allows a circuit to respond differently based on input signals?

• Switch

• Resistor

• Programmable controller (e.g. time clock or PLC)

• Junction box

Why are control circuits used in lighting systems?

• For constant illumination

• To manually switch lighting from multiple points

• For energy-efficient, automated operation

• To increase brightness