Power Times Resistance
The power p in watts w is equal to the voltage v in volts v times the current i in amps a.
Power times resistance. Resistance of an object is neither energy spent or a period of time. Power voltage current resistance p v i r calculator. So power consists of two things heat created or energy spent and time. This calculator is based on simple ohm s law as we have already shared ohm s law p i v r calculator in which you can also calculate three phase current.
The amount of current in a circuit depends on the amount of voltage and the amount of resistance in the circuit to oppose current flow. In this calculator table you may enter two of the four factors in ohm s law. Voltage sources deliver power while resistors use power by dissipating it as heat. Most electrical calculations involving resistance voltage current or power are solved using ohm s law.
For this reason the quantities of voltage and resistance are often stated as being between or across two points in a circuit. Power power p is a measure of the rate at which energy is delivered or used by a circuit element. The voltage v in volts v is equal to the current i in amps a times the resistance r in ohms ω. Sprinting requires 6 times more power even though the same amount of work has been done.
Ohm s law discovered in 1827 by georg simon ohm states that the current in a conductor is proportional to the voltage and inversely proportional to the resistance. But we have designed this one especially for dc circuits as well as work for single phase ac circuits without power factor. For national 5 physics solve problems using the relationships between current voltage and power and combine ohm s law to include resistance in calculations. They are power p or w measured in watts voltage v or e measured in volts current or amperage i measured in amps amperes and resistance r measured in ohms.
So in and of itself resistance has no relationship with work or with time interval. Since power measured in watts is a. The power p in watts w is equal to the squared current i in amps a times the resistance r in ohms ω. Just like voltage resistance is a quantity relative between two points.
The current is equal to the electromotive force of the source divided by the total circuit resistance.