1200W how many kwh does the electric heater consume?

1 degree = 1000 watt, 1 hour = 1 kwh.

The formula for finding power is power = work/time. Power is a physical quantity representing the speed of doing work, and power is equal to the scalar product of the acting force and the speed of the point where the object is stressed.

Extended data;

In our daily life, we often call power horse power, just as we call torque torsion.

In the automobile field, the biggest working machine is the engine. Engine power is calculated by torque, and the formula is quite simple: power (w)=2π× torque (Nm)× speed (rpm)/60. After simplified calculation, it becomes: power (W)= torque (Nm)× rotational speed (rpm)/9.549.

Because of the difference between English and metric systems, the definition of horsepower is basically different. British horsepower (hp) is defined as: a horse pulls an object weighing 200 pounds (lb) 165 feet (ft) in one minute, which is equal to 33,000 pounds feet/minute after multiplication.

Metric horsepower (PS) is defined as a horse pulling a 75kg object for 60m in one minute, which is equal to 4500kg.g.m/min after multiplication.

After unit conversion, (1lb = 0.454kg; 1ft=0.3048m) unexpected discovery 1hp=4566kgm/min, slightly different from the metric 1ps = 4500kg.m/min.

And if converted into watts (1w =1nm/sec =1/9.8kg.m/sec), it is1HP = 746w; 1ps=735W, two different results, the difference is about 1.5%.

DIN in Germany, EEC in Europe and JIS in Japan are all based on metric PS, while hp in Britain is used in SAE.

However, due to the arrival of the global economy, in order to avoid complicated conversion, more and more original factory data are changed to provide the undisputed international standard unit kW kW as the engine power output value.

Reference source; Baidu Encyclopedia-Power