A positive connection is one in which a change (increase or decrease) in some variable results in the same type of change (increase or decrease)in a second variable. The positive connection in the figure below for a cooling coffee cup implies that the hotter the coffee is the faster it cools.
The power consumption of small devices is usually measured in Watts, and the power consumption of larger devices is measured in kilowatts (kW), or 1,000 Watts. Electricity generation capacity is often measured in multiples of kilowatts, such as megawatts (MW) and gigawatts (GW).
A Unit is a measure of energy used in billing.   A Watt is a measure of power, which is how fast energy is  converted.    Energy equals power times time, so 1 watt â¦ for 1 second defines 1  Joule of energy.   A Unit is a kilowatt-hour of energy, so 1000 watts for 3600  seconds, 3.6 million Joules.   Another Answer   A 'unit' is derived from the expression, 'Board of Trade  Unit'. Unit is a measure of energy used in billing.   A Watt is a measure of power, which is how fast energy is  converted.    Energy equals power times time, so 1 watt â¦ for 1 second defines 1  Joule of energy.