W — watts
How quickly something uses energy right now.
Like water flowing from a tap: more watts means a faster flow.
No-jargon energy guide
Watts, kWh, Ah and volts—made simple
Choose a household appliance or a battery example. We ask for the missing time or voltage because these units cannot be honestly converted without it.
Choose what you want to understand
These units do not swap by themselves
Simple theoretical result before losses
2.40 kWh
2400 Wh
Understand it like you are five
kWh — kilowatt-hours
How much energy was used over time.
Like counting how many buckets the tap filled. This is the unit normally shown on an electricity bill.
V — volts
The electrical push.
Like the pressure pushing water through a pipe.
Ah — amp-hours
One way batteries describe capacity.
Ah needs a voltage before we can compare it with Wh or kWh.
Common questions
Can I convert watts directly to kWh?
Not without time. Watts measure power now, while kWh measures energy used over a period. Multiply watts by hours, then divide by 1,000.
How many kWh is a 12V 100Ah battery?
The simple theoretical capacity is 1.2kWh: 12 volts multiplied by 100 amp-hours equals 1,200Wh. Usable energy can be lower because real systems have limits and losses.
Why do I need voltage to convert Ah?
Amp-hours alone do not tell you energy. The same Ah rating at a higher voltage represents more watt-hours.