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What size resistor is required to limit the current from a 12V battery to 2 mA?
Wiki User
∙ 14y ago
In order to determine the Size of Resistor required we need
1. Value of R=V/I=12/2E-3=6000 Ohms
2. Power dissipated=VxI=12x2=24mW. Hence we can use 1/8W Resistor.
3. Tolerance on R will depend on the error on Current that is acceptable. Say %
4. The will depend on Tolerance,Bandwidth and Temp. Stability required.
>2% Tol Any type Carbon, Metal Film
>1%Metal Film/Wire Wound
<1% Wire Wound
Wiki User
∙ 14y ago
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A resistor is required to limit the current taken by a battery when being charged from a 25V dc source. Continued......?
QUESTION (continued from above) ....The battery has negligible resistance and its open-circuit voltage is 20V. Determine the resistance, if the current to the battery is to be limited to 25A.
Why current limiting resistor is required?
to keep the signal awy from the dc limit ,, to ban the clipping of the signal
What is function of fixe resistor?
To limit the current
What is the function of fixed resistor?
To limit the current
What is the job of a resistor?
To limit current flow in a circuit
What are the practical applications of resistor?
To limit current in circuit
How much resistance is required to limit the current to 1.5 mA if the potential drop across the resistor is 6V?
Using ohm's law, V=IR then R=V/I =6/0.0015=4000 ohm = 4k ohm resistor.
What is d use of connecting resistor in circuits?
to limit the current
What is the purpose of a resistor in an electronic circuit If the resistor converts energy to heat then are you wasting energy any time you use a resistor?
In its simplest use a resistor in a circuit is used to limit the amount of current flow, or to decrease the amount of voltage applied to a device. One example is you had a 12 volt battery and you need/ wanted to connect it to a device that ran on 9 volts then a resistor can be chosen to reduce the 12 volts to the 9 volts required.
What is a functoin of a resistor?
esistors restrict the flow of electric current, for example a resistor is placed in series with a light-emitting diode (LED) to limit the current passing through the LED.
Can you charge an 8 volt battery with a 12 volt charger?
No, it would overcharge and ruin the battery. #2 You can do it by using a series resistor to limit the current. The resistance needed is equal to the voltage drop divided by the charging current. The voltage drop is 4, and the charging current is one tenth the battery capacity, for example for a 2000 mAh battery the charging current is 200 mA. So the resistance needed is 4/0.2 or 20 ohms. The power dissipated in the resistor is 4 x 0.2, or 0.8 watts, so you need a 20 ohm 1-watt resistor. The battery should be charged for at least 10 hours if fully discharged, or until it becomes slightly warm to the touch. Do NOT let it overheat.
Where are resistors placed to control voltage and current?
A: A RESISTOR is a passive component it cannot control voltage these components and/or current it can however limit
