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What formula would be used to find the maximum current that can be carried by a resistor if the resistor's resistance and wattage rating are known?
Wiki User
∙ 7y ago
You use a combination of Ohm's law ( V = I * R ) and the power formula ( P = V * I ).
- Substituting you get: P = ( I * R ) * I = I**2 * R
- Dividing both sides by R you get: P / R = I**2 * R / R = I**2
- Taking the square root of both sides you get: SQRT( P / R) = I
- Swapping sides of the equals sign you get: I = SQRT( P / R )
Wiki User
∙ 7y ago
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If the resistance in the circuit is increased what will happen to the current and voltage?
* resistance increases voltage. Adding more resistance to a circuit will alter the circuit pathway(s) and that change will force a change in voltage, current or both. Adding resistance will affect circuit voltage and current differently depending on whether that resistance is added in series or parallel. (In the question asked, it was not specified.) For a series circuit with one or more resistors, adding resistance in series will reduce total current and will reduce the voltage drop across each existing resistor. (Less current through a resistor means less voltage drop across it.) Total voltage in the circuit will remain the same. (The rule being that the total applied voltage is said to be dropped or felt across the circuit as a whole.) And the sum of the voltage drops in a series circuit is equal to the applied voltage, of course. If resistance is added in parallel to a circuit with one existing circuit resistor, total current in the circuit will increase, and the voltage across the added resistor will be the same as it for the one existing resistor and will be equal to the applied voltage. (The rule being that if only one resistor is in a circuit, hooking another resistor in parallel will have no effect on the voltage drop across or current flow through that single original resistor.) Hooking another resistor across one resistor in a series circuit that has two or more existing resistors will result in an increase in total current in the circuit, an increase in the voltage drop across the other resistors in the circuit, and a decrease in the voltage drop across the resistor across which the newly added resistor has been connected. The newly added resistor will, of course, have the same voltage drop as the resistor across which it is connected.
What is the main difference in operation between diodes and resistors?
A diode is an electronic component which only allows the current to pass through it in one direction. This is useful in many aplications, such as preventing current to flow in the wrong direction in a circuit. A resistor is also an electronic component, but instead of preventing the current from moving in a certain direction the resistor creates an electrical resistance which will effect the current passing through it. The larger the resistance of the resistor, which is measured in Ohm, the greater the effect it will have on the current.
What does a resistor do to the flow of energy?
It depends on what sort of circuit the resistor(s) is in. The resistor(s) can lower either EMT (Voltage) or Current (Amperage) Sometime resistors are used to create an EMT differential whenever current is flowing.
In a circuit with a 10ohm resistor and a 12 ohm resistor in parralell and a 4 ohm resistor in series with a supply voltage of 20 volts what is the current?
First we need to know the total resistance which means all series resistors add up and all parallel resistors equal the reciprocal of the reciprocal of the resistances added together.R1 = 10ohmR2 = 12ohmR3 = 4ohm( 1 / ( (1/R1) + (1/R2) ) ) = 5.4545ohm *approxR = 5.4545 + R3 = 9.4545ohm *approxNow that we know the total resistance we can use Ohm's Law to find current.I = E / R (I = Current, E=Voltage, R=Resistance)E = 20vR = 9.4545ohmI = 20 / 9.4545So our Current is approximately 2.1153948Using a scientific calculator will yield a more precise approximation
What is the strength of current in each resistor of a series circuit?
The current in each resistor in a series circuit is the same. Kirchoff's Current Law states that the sum of the currents entering a node must add up to zero. The connection between two resistors in a series circuit is a node. The current entering the node from one resistor is equal to the current leaving the node into the next resistor.
You are just asking that let us assume you have connected 2 or 3 resistors in a circuit and the current flowing through the circuit and from all the resistors will be same but how?
If the resistors are connected in series, the total resistance will be the sum of the resistances of each resistor, and the current flow will be the same thru all of them. if the resistors are connected in parallel, then the current thru each resistor would depend on the resistance of that resistor, the total resistance would be the inverse of the sum of the inverses of the resistance of each resistor. Total current would depend on the voltage and the total resistance
What are the losses in resistors?
The power lost in a resistor is(the current through the resistor) times (the resistance) watts. That's the same thing as(the voltage across the resistor)/(the resistance)watts.
Is a calculator a resistor?
No, but it has resistance. Everything has resistance to current flow. It's sole purpose is not to resist current. It likely has resistors in it though.
Resistors A and B are connected in parallel If resistor B has twice the resistance of A what is the current taken by resistor B?
half of the current flowing thru resistor 1.... V=IR.
Will current flow in a higher resistance or in lower resistance if they are connected in parallel to a voltage source?
Current will always flow in both resistors, but the one with the lower resistance will have more current flow through it. The value of the current in each resistor is calculated by dividing the voltage of the source by the resistance of the individual resistor. As long as the capability of the power source isn't exceeded, the current through each resistor isn't affected by the presence of the other resistor. Said another way, if two resistors are connected in parallel across a source, neither one "cares" that the other resistor is connected across the source. The two resistors work independently.
What will happen to the other resistor if the number of resistor decreases?
the voltage across that resistor will increase if it is in series with the other resistors. the current through that resistor will increase if it is in parallel with the other resistors.
If the current in a certain resistor is 6.2 A and the voltage across the resistor is 110 Vwhat is the resistance of the resistors?
Ohm's Law says Volts = Current x Resistance so R = 110/6.2 = 17.742 Ohms
What is the current of a 25volt resistor?
Resistors are rated in ohms for their resistance value and in watts for the power they are capable of handling. They are not rated in volts or current.
What happens to the value of a resistor when it goes bad?
we can say that a resistor gone bad if 1. its resistance is different than that printed by the color code 2. doesn't conduct any current Resistors normally will burn open. Carbon resistors almost always do this, while wireound resistors can lower in resistance. They may still allow current flow, but it will not be correct.
What happen to current when paralle resistor added?
For the individual resistor, the current is constant, regardless of any other resister that's attached to it in parallel. The current that results from all the resistors combined decreases as the resistance of one or more of the resistors increases.
How sensitive is 22k resistor?
"Sensitivity" is not a word normally applied to resistors. Characteristics of resistors include "resistance", "tolerance", "power rating", and "temperature coefficient". "Inductance" and "capacitance" are also used in describing certain critical performance resistors. A 22 KOhm resistor will require 22 v of voltage to induce a current of 1 ma. This is Ohm's Law: voltage = current times resistance.
What is resistor used for?
A Resistor Is Used To Limit The Current In A CircuitFurther AnswerA resistor is sometimes used to modify the natural resistance of a circuit -e.g. by adding a resistor in series, you can increase the natural resistance; by adding a resistor in parallel, you can decrease the natural resistance. Two or more resistors can be used to create a voltage divider -a method of obtaining a voltage lower than the supply voltage in a d.c. circuit.Use of resistor is to produce a particular amount of resistance to the flow of current
