7 or 8
It means you can run whatever off the battery as long as power x time = 5. Ten watts for 0.5 hours. Five watts for 1 hour or 2.5 watts for 2 hours.
Depends on the capacity, the ampere-hours. As watts/volts = current, 100W will mean a current of 8.3A So basically if you had a 83Ah(amp-hours) battery, it would last for one hour. A 41Ah battery would last half an hour. A 166Ah battery would last two hours.
The bulb's power, 75 watts, is the power it uses continuously all the time it is switched on. The energy it uses can be measured in watt-seconds (Joules) or in watt-hours. A 75 watt bulb uses 75 watt-hours each hour, which is 0.075 kilowatt-hour.
Let us consider that Watts means Watt-hours per hour. So a battery charger that consumes 15 Watt-hours per hour will consume 15x24 Watt-hours per day. And at 0.06 dollars per 1000 Watt-hours the cost will be 15x24x0.06/1000 or just over two pennies per day.
. . runs at a constant 60 watts of electric power. In an hour it uses up 60 watt-hours of energy.
It means you can run whatever off the battery as long as power x time = 5. Ten watts for 0.5 hours. Five watts for 1 hour or 2.5 watts for 2 hours.
Depends on the capacity, the ampere-hours. As watts/volts = current, 100W will mean a current of 8.3A So basically if you had a 83Ah(amp-hours) battery, it would last for one hour. A 41Ah battery would last half an hour. A 166Ah battery would last two hours.
It stands for watt-hour. In relationship to batteries, it measures how many watts in an hour a battery can sustain. A 63 watt-hour battery will supply 63 watts for 1 hour, or 6.3 watts for 10 hours or 31.5 watts for 2 hours, etc. It is extremely difficult to determine, from this number, how long your equipment (say, a laptop) will run using a 63 hour battery. The thing for which this number is most useful is battery comparison. A 20 WHr battery will last twice as long as a 10 WHr battery and half as long as a 40 WHr battery and so on.
watts is an instantaneous measurement of energy. There is no time component. If you can produce 20 watts, then you can power exactly 20 watts for as long as that is being produced. If you have a 20 watt hour battery, you should be able to power a load requiring 5 watts for (20/5 =) 4 hours.
The bulb's power, 75 watts, is the power it uses continuously all the time it is switched on. The energy it uses can be measured in watt-seconds (Joules) or in watt-hours. A 75 watt bulb uses 75 watt-hours each hour, which is 0.075 kilowatt-hour.
There is too much information there. Charging a 100 amp-hour battery fully would take 18 hours at 5.5 amps, or 6 hours at 16.67 amps. At 5.5 amps the power would be 12x5.5 or 66 watts, and this is the rating of the solar panel required. That would be about 0.4 of a square metre.
85/35=2.4286 hours.
You can not convert Watts (Power) to Ampere-Hours (Amount of charge)!!! Exept if you know the voltage and the amount of time you use the power. For example: If you use P=216 W from a battery of V=12 Volts for t=1 hour, that would be: Current I=P/V=216/12=18 Amperes In time of 1 hour, you will take Q=I*t=18 Ampere-Hours from the 12 Volts battery.
Let us consider that Watts means Watt-hours per hour. So a battery charger that consumes 15 Watt-hours per hour will consume 15x24 Watt-hours per day. And at 0.06 dollars per 1000 Watt-hours the cost will be 15x24x0.06/1000 or just over two pennies per day.
Watts is smaller than kilowatts. watts is unit of power and kilowatts hour is unit of energy. Electrical devices are specified in watts where as electrical bill is for kilowatt hr use.
. . runs at a constant 60 watts of electric power. In an hour it uses up 60 watt-hours of energy.
The calculation of kilowatt-hours (kWh) is done by multiplying the power consumption in kilowatts (kW) by the time in hours (h) that the power is being used. kWh = kW × h. For example, if a device has a power rating of 1 kW and is used for 2 hours, the energy consumption would be 2 kWh.