# Energy Consumption Formula

Energy Consumption Formula

Energy consumption is the use of power or energy of a system by making use of supply. The consumption is done in Giga Joule per year, kilograms of oil equivalent per year (kg/a) and in Watts.

The energy consumption formula is articulated as,

$E_{kwh/day}=\frac{P_{w}\times&space;t_{(h/day)}}{1000(W/kW)}$

Where,
E is energy in kilowatt-hours(kWh),
P is power in Watts,
t is hours per day.

Energy  Consumption Solved Problems

Here are some cracked examples based on Energy Consumption:

Problem 1: Compute the energy consumption in a system that consumes 190 Watts of power and works for 3 hrs a day.

Given: Power P = 190 W, th/day = 3 hrs

$E_{kwh/day}=\frac{P_{w}\times&space;t_{(h/day)}}{1000(W/kW)}$

$E_{kwh/day}=\frac{190\times&space;3\times&space;60\times&space;60}{1000}$

$E_{kwh/day}=2052J$

Therefore, the energy consumption is 2052J

Problem 2: A toy car consumes energy of 500 Watts of power if it works for 2 hrs a day using it. Calculate the energy consumption a day.

Given: Power P = 500 W, th/day = 2 hrs

$E_{(kwh/day)}=\frac{P_{w}\times&space;t_{h/day}}{1000(W/kW)}$

$E_{(kwh/day)}=\frac{500\times&space;2\times&space;60\times&space;60}{1000}$

$E_{(kwh/day)}=3600\;J$

#### Practise This Question

A car has to move on a level turn of radius 90 m. If the coefficient of static friction between the tyre and the road is 1.0, find the maximum speed the car can take without skidding.