Electricity Experiments

If i use 7.5watts of electricity at home constantly for a month how much would it cost per month?

I bought a plug-in pest repellent. It claims to only cost pennies a month to use. I was wondering if anyone knew how to calculate it. The provider we use scottish power and the device claims to be 7.5watts , but doesn’t have any amp/voltage figures on it.
It’ll be on constantly, how much will it cost?
Also, does anyone know if these things are any good? It’s a Viatek dual technology one that uses electromagnetic and ultrasonic technology

electricity suppliers charge by the kilowatt-hour
so a device using 1 kw for 1hour uses 1 unit
yours would take 1000/7.5 hours to use 1 unit. you would have to find the cost of a unit from your supplier (look at your last bill), but its probably not far from 10p

and i used a plug in mosquito repellent on holiday and i thought it worked very well. better than those god-awful anti-malarial tablets by a long way. they gave my friend panic attacks. and the local hospital said they prefer tourists not to take the tablets as they make detecting malaria more difficult

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