It's calculated by multiplying the voltage difference across two points by the current running between them , and is measured in units of a watt (W). Light bulbs, for example, power electricity into light. But a resistor can only turn electrical energy running through it into heat.
How do you find the power rating of a resistor?
It's calculated by multiplying the voltage difference across two points by the current running between them , and is measured in units of a watt (W). Light bulbs, for example, power electricity into light. But a resistor can only turn electrical energy running through it into heat.
How do you calculate power rating?
Calculate power rating in kilovolts-amperes, or “KVA,” when you know voltage and current rating. Use the formula: P(KVA) = VA/1000 where P(KVA) is power in KVA, V is voltage and A is current in amperes. For example, if V is 120 volts and A is 10 amperes, P(KVA) = VA/1000 = (120)(10)/1000 = 1.2 KVA.
What is average power formula?
If the resistance is much larger than the reactance of the capacitor or inductor, the average power is a dc circuit equation of P=V2/R , where V replaces the rms voltage.
What is the formula to calculate work done?
The formula for work is , work equals force times distance . In this case, there is only one force acting upon the object: the force due to gravity. Plug in our given information for the distance to solve for the work done by gravity.
How do you calculate IRMS?
- root mean square: The square root of the arithmetic mean of the squares.
- rms current: the root mean square of the current, Irms=I0/√2, where I0 is the peak current, in an AC system.
- rms voltage: the root mean square of the voltage, Vrms=V0/√2, where V0 is the peak voltage, in an AC system.
What is average power in radar?
The energy content of a continuous-wave radar transmission may be easily figured because the transmitter operates continuously. ... For this reason, pulse-repetition time is included in the power calculations for transmitters. Power measured over such a period of time is referred to as average power.
How do you calculate average power in watts?
Often it is convenient to calculate the average power. In the straightforward cases where a constant force moves an object at constant velocity, the power is just P = Fv . In a more general case where the velocity is not in the same direction as the force, then the scalar product of force and velocity must be used.
What is the formula of time and work?
Work Done = Time Taken × Rate of Work . Rate of Work = 1 / Time Taken . Time Taken = 1 / Rate of Work . If a piece of work is done in x number of days, then the work done in one day = 1/x.
What is IRMS value?
The root mean square value of a quantity is the. square root of the mean value of the squared. values of the quantity taken over an interval. The. RMS value of any function.
What is the formula for apparent power?
Apparent power: S = V x I (kVA)
How do you calculate peak current?
For example, when the AC waveform is an ideal sine wave, the relationship between RMS and Peak Current is as follows: RMS Current = Peak Current x 0.707 or Peak Current = RMS Current x 1.414 .
How is average power calculated in radar?
The energy content of the pulse is equal to the peak (maximum) power level of the pulse multiplied by the pulse width . However, meters used to measure power in radar system do so over a period of time that is longer than the pulse width. ... Power measured over such a period of time is referred to as average power.
What is duty cycle of radar?
It should be obvious that the duty cycle is the “ratio” between the PEAK energy in the radar pulse and the AVERAGE energy expended over a specified period of time .
What is maximum range and pulse recurrence frequency?
R max must be larger than the Maximum Display Range (so-called: instrumented range). Consider radar with pulse repetition frequency 1 000 Hz . The pulse period is its reciprocal value and is 1/ 1 000 = 1 ms. According to formula (2) the maximum unambiguous range of this radar is 150km.
What is the efficiency formula?
Efficiency is often measured as the ratio of useful output to total input, which can be expressed with the mathematical formula r=P/C , where P is the amount of useful output (“product”) produced per the amount C (“cost”) of resources consumed.
