Common types include:

• Single socket extension leads: Extend a single power outlet to one additional socket.
• Multi-socket extension leads: Provide multiple sockets from one power outlet, often ranging from 2 to 8 sockets.
• Surge-protected extension leads: Protect connected devices from power surges.
• Retractable extension leads: Have a reel for easy storage and length adjustment.
• USB extension leads: Include USB ports for charging devices.

A surge-protected extension lead has built-in components that protect connected devices from voltage spikes caused by power surges. These are particularly useful for protecting sensitive electronics like computers, TVs, and gaming consoles.

The number of devices depends on the extension lead’s number of sockets and its total power rating. Avoid exceeding the maximum current rating, typically 13 amps for most household extension leads. Check the power consumption of each device and ensure the total does not exceed the lead’s capacity.

It’s generally not recommended to connect multiple extension leads together (daisy-chaining) as it increases the risk of overloading the circuit, which can lead to overheating and potential fire hazards.

The maximum wattage depends on the extension lead’s rating. For a standard 13-amp extension lead, the maximum wattage is 3,120 watts (13 amps x 240 volts).