Following are the important characteristics of standard unit: (i) It should be easily understandable. (ii) It should be changed with change in physical factors. (iii) It should not change with place or time.

: a system of units based on the metric system and developed and refined by international convention especially for scientific work —abbreviation SI.

Characteristics of standard units.

• standard units should be easily understable.
• standard units should not change with place or time.
• standard units should be in accordance with the size of the quality to be measured.
• standard units should be changed with change in physical factors.

Two characteristics of a unit are:

• It should be of convenient size.
• It must be universally accepted i.e. its value must remain the same at all places and at all times.

Characteristics of Standard Unit:

• It should be well defined without any doubt or ambiguity.
• It should be of suitable size.
• It should be easily available.
• It should be non-destructible.
• It should not change with time.
• It should not change with the place.
• It should be easily reproducible.

Answer. An individual thing or person regarded as single and complete but which can also form and individual component of a larger or Complex while is called unit. The standard unit is used around the world also called the metric system.

The coulomb is the SI unit of charge. The size of a coulomb is derived from the ampere. One coulomb is defined as the amount of charge flowing when the current is 1 ampere.

The unit of electric charge in the metre–kilogram–second and SI systems is the coulomb and is defined as the amount of electric charge that flows through a cross section of a conductor in an electric circuit during each second when the current has a value of one ampere.

Nowdays, I am happy to anounce, the coulomb is no longer a derivied SI unit but a fundamental one. This happened in May this year. The coulomb is defined so that coulombs is the charge of the proton. Before this it was defined as a ampere-second with the ampere having a rather obscure definition.

Answer: Ohm’s law relates charge time and current.

Steps

1. The number of watts is equal to amps multiplied by volts. That’s it!
2. For example, if the current is 3 amps (3A) and the voltage is 110V, you multiply 3 by 110, to get 330W (watts). The formula is P=3A X 110V = 330 W (with P standing for power).
3. This is why watts are sometimes called volt-amps.

The kW to kVA Formula: Apparent power (kVA) x power factor (pf) = actual power (kW) e.g. 100 kVA x 0.8 = 80 kW. The formula for converting kW into kVA is: Actual power (kW) / power factor (pf) = apparent power (kVA)

It’s calculated by multiplying voltage by amperage. Therefore the 120 VAC x 0.3 Amps equals 36 Watts. DC Voltage – Output Voltage is rating of your battery system, usually a single 12 volt battery. We use 12.5 volts for 12 volt battery systems.

Watt’s Law states that: Power (in Watts) = Voltage (in Volts) x Current (in Amps) P = V I Combining with Ohm’s law we get two other useful forms: P = V*V / R and P = I*I*R Power is a measurement of the amount of work that can be done with the circuit, such as turning a motor or lighiting a light bulb.

168 Watts

2.917 amps

0.500 amps

Converting watts to amps can be done using the power formula, which states that I = P ÷ E, where P is power measured in watts, I is current measured in amps, and E is voltage measured in volts. Thus, the current I in amps is equal to the power P in watts divided by the voltage V in volts.

The formula is 30 amps X 120 volts = 3,600 watts.