Your water heater is set for use during Time of Day "off peak" hours. If it uses 1500VA and operates for 3 hours, giving you a full tank for the day, how much does it cost per month (30 days) at $.033/KWH

A 1500 W microwave oven runs off of a 240 V supply. The current drawn is by the microwave is 6.25Amps  a)  If the electricity cost is $0.0925 per kWh, how much does it cost to run the microwave for 5 min?

I have a computer that consumes a maximum of 15 W of power and I use a 5000 mAh battery. How long will it last at maximum power draw assuming it uses 20 V.

How to solve for the following:

help

(a) What is the cost of heating a hot tub containing 1510 kg of water from 10.0°C to 40.0°C, assuming 75.0% efficiency to take heat loss to surroundings into account? The cost of electricity is 9.00¢/(kW • h) and the specific heat for water is 4184 J/(kg · °C). $ (b) What current was used by the 220 V AC electric heater, if this took 4.95 h? Additional Materials O Reading

The term "electrical load capacity" refers to the total amount of power provided by the main service for use by your home's branch circuits and the lights, outlets, and appliances connected to them. Understanding capacity and load becomes necessary if you are planning the electrical service for a new home, or if you are considering an electrical service upgrade to an older home. Understanding the load needs will let you choose an electrical service with an appropriate capacity. In older homes, it's extremely common for the existing service to be badly undersized for the needs of all the modern appliances and features now in use. But how much should you actually load each of the branch circuits to maintain a safe circuit load? How to determine the total safe amperage capacity to load the circuit.