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What resistor or resistors do I use to replace 3 9V batteries -powering about 20 small flashing leds- and connect them all to one AC plug?
Wiki User
∙ 9y ago
You need to find out the voltage needed. If the batteries are in parallel it's 9 v but if they are in series it's 27 v.
Then buy an adaptor for the right voltage. For 27 v you can use a printer power supply because they often work on 30 v.
Wiki User
∙ 9y ago
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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
Do potentiometers have polarity?
no there is no consideration of positive or negative legs in case of resistor.
What is a function of a resistor in a smoke detector?
Resistor have a definite function in circuits and because every resistor disspates power, it is not included in the circuit without good reason. Some smoke detectors have electronic circuits in them, and these would have resistors, but it is not possible to be more specific.
Are there diagonal resistors in an electric circuit?
I must tell you that I've been building, troubleshooting, and studying electronics (in that order) for more than a half century, and this is the first time I have ever encountered the concept of a "diagonal resistor". I really should let this question pass, because I really have no idea what it means. But I'm somehow drawn to it. At the frequencies of devices that even use discrete resistors any more, the physical position and orientation of the resistors has no effect on their electrical characteristics or performance in the circuit. If the position mattered, then there would be a big red "THIS END UP" arrow on every transistor radio and boombox. And if, by chance, you're referring to the presentation of resistors on electrical schematic diagrams, please relax. The arrangement of the components and their symbols on the schematic is completely a matter of making a clear drawing, and has absolutely no relationship to their physical arrangement in the circuit when it's constructed. At least not until you get into microwave devices, and at that point, trust me, you and I would not even recognize a resistor in the circuit if we were looking at one.
What is s device that interferes with the flow of an electrical charge?
You cannot 'slow' the flow of current in a wire. What you can do, however, is to reduce its value, or to limit its upper value. The device that will do this is a resistor. If, by your question, you are asking how to reduce the rate of change in its magnitude, then you can use an inductor.
What is true of a series circuit that has two resistors?
Which is true of a series circuit that has two resistors?A.The resistors are on different branches of the circuit.B.Neither resistor has current flowing through it.C.One resistor has no voltage across it.D.Both resistors have current flowing through them.
What happens to the voltage values of other resistors when a short occurs in one of them?
If a short occurs in a resistor in series with other resistors, the voltage drops across the other resistors will increase. If a short occurs in a resistor in parallel with other resistors, the voltage drops across the other resistors will decrease, to zero.
What are the kind of resistor?
There are various forms of resistors used for electronic circuits. You can divide it in mainly two basic types:Fixed Resistors: The resistors that come with two wires are listed in this resistor type. These kinds of resistors do not allow you to change the resistance.Variable Resistors: These types of resistors allow you to change the resistance using the resistance using the knob.Some other types or resistors are as following:Carbon Film ResistorMetal Oxide Film ResistorPrecision Metal Film ResistorWire Wound Resistor (WWR)Power Film ResistorPrecision Wire Wound ResistorHigh Power Wire Wound ResistorPhotocellLight Dependant Resistor (LDR)Voltage Dependant Resistor (VDR)
What are the different kinds of resistor?
There are various forms of resistors used for electronic circuits. You can divide it in mainly two basic types:Fixed Resistors: The resistors that come with two wires are listed in this resistor type. These kinds of resistors do not allow you to change the resistance.Variable Resistors: These types of resistors allow you to change the resistance using the resistance using the knob.Some other types or resistors are as following:Carbon Film ResistorMetal Oxide Film ResistorPrecision Metal Film ResistorWire Wound Resistor (WWR)Power Film ResistorPrecision Wire Wound ResistorHigh Power Wire Wound ResistorPhotocellLight Dependant Resistor (LDR)Voltage Dependant Resistor (VDR)
How are the plus and minus voltage signs determined for resistors?
Resistors have no polarity. The voltage across a resistor is determined by the direction of current flowing through that resistor (and vice versa).
If as more resistors are connected in series with the first what happens to the potential difference across each resistor?
adding resistors to a string will have the effect of decreasing each resistor voltage drop.
Which has a highest resistance between shunt resistor and series resistor?
If you are placing more than one resistors in series, then its combined resistance is higher than when you place these resistors in shunt.
I have three identical resistors all at 100 ohms in what combination can I put them to obtain a resistance of 66.7?
If you have three 100 ohm resistors, and you want an equivalent resistor of 66.7 ohms, put two resistors in series, and then parallel the third resistor across the first two. Resistors in series: R1 + R2 Resistors in parallel: R1 * R2 / (R1 + R2) This example: Two 100 ohm resistors in series: 100 + 100 = 200 A 100 ohm resistor in parallel with a 200 ohm resistor: 100 * 200 / (100 + 200) = 66.7
Where is the resistor used?
The resistors are mainly used to reduce the current
Find the symbol of fixed resistor?
symbols of fixed resistors
How does the effective resistance of four resistors in parallel compared to the individual resistance?
It depends on the values of the individual resistors. But if each resistor is identical, then the total resistance will be one-quarter that of an individual resistor.
How do resistors act in parallel?
Parallel resistors act like a resistor smaller than the smallest parallel resistor. Calculate as 1/(1/R1+1/R2+1/R3...)
