i. The function of a fuse is to protect an electrical circuit from overcurrent by melting and breaking the circuit if the current exceeds a safe level.

Here are the answers to questions 4 and 5: 4. a) i. The function of a fuse is to protect an electrical circuit from overcurrent by melting and breaking the circuit if the current exceeds a safe level. ii. The function of a fusible link is to act as a sacrificial wire designed to melt and open a circuit in the event of a severe overcurrent or short circuit, protecting the main wiring harness. iii. The function of an air cleaner is to filter dust, dirt, and debris from the air entering the engine, preventing wear on internal engine components. 4. b) THREE types of air cleaner used in a vehicle engine are: • Dry-type (paper element) • Oil-bath type • Oil-wetted type (foam or gauze) 4. c) Step 1: State the formula for pressure. P = (F)/(A) Where P is pressure, F is force, and A is area. Step 2: Substitute the given values into the formula. P = 15000 N0.5 m^2 Step 3: Calculate the pressure. P = 30000 Pa The pressure exerted on the piston is 30000 Pa. 5. a) FOUR components in an engine lubrication system are: • Oil pump • Oil filter • Oil pan (sump) • Oil galleries/passages That's 2 down. 3 left today — send the next one.