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How do you calculate the correct resistor value needed using 12vdc to run 6vdc circuit?
Wiki User
∙ 10y ago
You need to drop 6 volts across the resistor.
-- The resistor you need is 6/(the current in amps that your 6vdc device uses to operate) ohms.
Example:
If the device uses 1/2 Amp when it's running, then you need a 6/0.5 = 12-ohm resistor.
-- And the power-dissipation rating of the resistor has to be at least 36/resistance watts.
Example:
For the 12-ohm resistor in the last example, it needs to be a (3-watt or more) resistor.
Wiki User
∙ 10y ago
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What is needed to calculate the voltage across a device?
you calculate a voltage circuit by taking it apart and findng the circuit and calculate the voltage and then resible it.
What do you need to build a circuit?
The things needed to build a circuit are:Circuit elements like resistor capacitors, inductors etcConnectors (cables)A source
Why is a resistor needed to discharge or charge a capacitor in an electric circuit?
A resistor may be used in series charging for current limiting, filtering, or as a signal isolater. Resistors across caps are to discharge them for your safety or equalize voltages across the caps in series filtering circuit.
When is the resistor bypass used in the ignition circuit?
The resistor bypass in the ignition circuit is used when starting the engine. It bypasses the resistor to provide full battery voltage to the ignition coil, ensuring a strong spark for a quick and reliable engine start. Once the engine is running, the bypass is no longer needed and the resistor is re-engaged to limit the voltage to the ignition coil for normal operation.
What happen if resistors has high power?
The power rating of the resistor only tells the amount of power it's able to dissipate without overheating, melting, or exploding. The amount of power that a resistor dissipates is determined by its resistance and the current through it (or voltage across it). If you put a small resistor at a place in the circuit where it must dissipate more power than it's rated for, then it'll overheat and possibly fail. If you put a high power resistor at a place in the circuit where it dissipates much less power than it's rated for, then nothing happens at all. It simply takes up more space on the board than was necessary, because it's bigger than what was needed there, and you spent more money than you needed to spend for the kind of resistor that you needed at that place in the circuit.
Define zero ohm resistor.?
A zero-ohm resistor does not exist, so we are talking about an ideal resistor. An ideal resistor is needed for description in a circuit, where we lump all wire/parasitic resistances into discrete resistors, but the wire joining two discrete resistors is considered to have no resistance. My definition: a zero-ohm resistor is an ideal resistor that does not consume energy when a current exists in the resistor. Alternatively, a zero-ohm resistor is an ideal resistor that cannot sustain any potential drop when a current is on. Thirdly, a zero-ohm resistor is an ideal resistor that will conduct an infinite current when a voltage is applied across it.
Can a resistor be installed backwards?
Resistors can be installed in any direction in a circuit. It doesn't matter in which direction you are installing a resistor. Resistor will resist the current in both sides of the connection. You can also apply capacitor in any direction for alternating current. Where as if you are concerned with direct current, a direction is needed to apply the connection
Materials needed to make a resistor.?
carbon
If you have a 12point6V battery and a 9V receiver how can you work out which resistor is needed?
you better not. you need a 9V regulator for this, not a resistor!
Why do you need a parallel circuit to measure voltage?
Voltage is a defined as a difference in potential. So to measure voltage, you need to look at the difference in potential between two different nodes in a circuit. For example, to know the voltage of a capacitor, you are looking at the difference in potential from one terminal of the capacitor to the other. Even if it is installed in a circuit. It is for this reason, that the measurement is across the circuit, or in parallel with it. One common point of confusion in voltage measurement is the way it is presented. Someone will say, that wire is at 5 volts. The "with reference to" part is often left off. We can say this because most circuits have a direct or implied ground, that all other voltages are referenced to. So the correct thing to say would be "that wire is at 5 volts to ground."
If a 100 ohm resistor is needed in an electric circuit carrying a current of 0.3 amperewhat resistor would you select?
A 100 ohm resistor carrying a current of 0.3 amperes would, by Ohm's Law, have a potential difference of 30 volts. A current of 0.3 amperes through a voltage of 30 volts would, by the Power Law, dissipate a power of 9 watts. You need a 10 watt resistor, alhough it is better to use a 20 watt resistor. E = IR 30 = (0.3)(100) P = IE 9 = (30)(0.3)
Is a switch needed to make a circuit work?
Not always. Depends on the circuit.
