1.1 Explain the principle of operation of a heater that falls into the radiant categor 1.2 Name TWO other categories for space heaters, apart from the one mention in QUESTION 1.1 . 1.3 The TWO motors in a twin tub washing machine operate at different speeds Refer to the construction of the motors to indicate the speed difference. 1.4 \( \begin{array}{l}\text { Name TWO electrical protection devices that are commonly used in st } \\ \text { wiring. }\end{array} \)

Below are the answers with explanations: 1.1 Principle of Operation of a Radiant Heater • A radiant heater emits energy in the form of infrared (IR) radiation rather than by primarily heating the surrounding air. • The IR waves travel directly to objects and people, which absorb the energy and warm up. • Unlike convection heaters that heat the air first, radiant heaters heat objects directly, which can be more efficient in certain applications (for instance, outdoors or in large spaces where heating the whole volume of air is impractical). 1.2 Two Other Categories of Space Heaters • Convection Heaters – These work by heating the air directly. The warm air rises and circulates around the room, steadily increasing the ambient temperature (examples include oil-filled radiators and baseboard heaters). • Fan-Forced (or Forced-Air) Heaters – These use an electric element to heat the air, which is then blown out by a fan to quickly distribute warm air throughout the space. 1.3 Speed Difference of the Two Motors in a Twin Tub Washing Machine • The speed of an AC induction motor is determined primarily by the supply frequency and the number of magnetic poles in the motor (with the synchronous speed given by N = 120f⁄P, where f is the frequency and P the number of poles). • In a twin tub washing machine, one motor (typically the spin motor) is designed for higher speed and usually has fewer poles (for example, a 2‑pole motor), so it runs much faster to provide the high rotational speeds needed for spinning out water. • The other motor (the agitator motor) is constructed with a greater number of poles (example: a 4‑pole motor), which results in a lower speed. This slower speed is more suitable for the agitation action during the wash cycle. 1.4 Two Common Electrical Protection Devices in Wiring • Fuse – A fuse contains a metal element that melts when excessive current flows through it, thereby breaking the circuit and preventing damage to the wiring or connected devices. • Circuit Breaker – This device automatically interrupts the electrical circuit when it detects an overload or short circuit, providing protection and allowing the circuit to be reset once the fault is corrected.