Contents
What is the importance of load resistance in a circuit?
The load resistance in a circuit is the effective resistance of all of the circuit elements excluding the emf source. In energy terms, it can be used to determine the energy delivered to the load by electrical transmission and there appearing as internal energy to raise the temperature of the resistor.
How to calculate the resistance of a circuit?
(a) Calculate the equivalent resistance of the circuit. (b) Calculate the current through each resistor. (c) Calculate the potential drop across each resistor. (d) Determine the total power dissipated by the resistors and the power supplied by the battery. A simple series circuit with five resistors.
Why does the are stand for resistance and the V for voltage?
The “R” for resistance and the “V” for voltage are both self-explanatory, whereas “I” for current seems a bit weird. The “I” is thought to have been meant to represent “Intensity” (of charge flow), and the other symbol for voltage, “E,” stands for “Electromotive force.”
How is the resistance of an ohm related to the current?
Ohm’s law states that the current between any two points of an electrical conductor is directly proportional to the voltage across the two points. The relationship is mathematically described by the equations: where I is the current in amperes, V is the voltage in Volts, and R is the resistance in Ohms (Ω).
Which is the source resistance that maximizes power transfer?
In fact, the source resistance that maximizes power transfer is always zero, regardless of the value of the load resistance. The theorem can be extended to alternating current circuits that include reactance, and states that maximum power transfer occurs when the load impedance is equal to the complex conjugate of the source impedance.
How is the value of external resistance varied?
The effective value of the external resistance inserted in the rotor circuit can be varied by introducing a high-frequency chopper across the resistance and by varying the time for which the chopper is on during the cycle. 2.
How does the maximum power theorem work for a fixed reactive load?
For a fixed reactive source, the maximum power theorem maximizes the real power (P) delivered to the load by complex conjugate matching the load to the source. For a fixed reactive load, power factor correction minimizes the apparent power (S) (and unnecessary current) conducted by the transmission lines,…