Finding intermittent faults that take out fuses when youa re somewhere else in the shop can be a pain to catch...The point of my light bulb across the breaker/fuse is the light turns ON when the breaker pops and this is very handy when you are elsewhere in the shop and the fuse is on an intermittent circuit.
Cuba: Electricity. Although the power supply in Cuba is mainly 110 volts, most of the modern hotels have dual voltage with all the sockets in the room being 220 volts. Usually in the bathroom there is an 110 volt socket suitable for shavers and charging batteries. A 4 gang 13 amp extension lead could well prove very useful.
All UK appliances will work in Cuba and all you will need is an adapter. Wilkinsons (Wilko's) sell two adapters in one pack (1 euro rounded two pin and one North American flat pin) costing Â£3.75 as at June 2015. The type of adapters necessary for UK travellers are shown below. The sockets in the rooms are cleverly designed so they will take the North American flat 2 pin and the European rounded two pin plugs and are usually similar to these, the bottom one being the one in the bathroom.