WebThe energy E in kilowatt-hours (kWh) per day is equal to the power P in watts (W) times number of usage hours per day t divided by 1000 watts per kilowatt: E (kWh/day) = P (W) × t (h/day) / 1000 (W/kW) Electricity cost calculation. WebIf you use it for 2 hours, you have used 120 watt-hours of energy. If you turn it on for only 1 minute, you have used 1 watt-hour. It's a little confusing since the "per hour" is inside the term "watt", so to make the rate into an amount, you need to multiply by a …

Electricity usage of a Cordless Phone - Energy Use Calculator

WebOct 10, 2024 · Multiply by hours used per day. The wattage tells you the rate energy is consumed while the appliance is active. Multiply the wattage by the number of hours the device runs during an average day. Example: If the microwave runs for half an hour each day, multiply 780 watts x 0.5 hours / day = 390 watt hours per day. 5 Divide by 1000. WebOne point not yet mentioned: a 60 watt bulb will use 60 watt-hours per hour, or 60 watt-seconds per second, or 60 watt-microseconds per microsecond, or 60 watt-centuries per … norfolk naval hospital maternity unit

Battery Capacity Calculator

WebJan 25, 2024 · 24W * 3.5 hours = 84Wh per day LED light strips can be cut to size. If you were only looking to use half the number of lights (8.2′ instead of 16.4′), then divide this … WebMar 9, 2024 · A watt hour (Wh) is a unit of energy equal to 1 watt (W) of power sustained for 1 hour. When talking about devices and appliances, using watt hours is a way of … WebEstimate the number of hours per day an appliance runs. There are two ways to do this: - Rough estimate If you know about how much you use an appliance every day, you can roughly estimate the number of hours it runs. For example, if you know you normally watch about 4 hours of television every day, you can use that number. how to remove link from orient watch