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What else can I help you with?
Why does a wire get hot when an electric current passes through it?
Because the wire has resistance.The power (number of watts) dissipated by any resistance when current passes through it is(the number of amperes of current)2 multiplied by (the number of ohms of resistance).To reduce the power lost from the wire, the choices are:-- reduce the current passing through the wire-- use thicker wire-- keep the wire as cold as possible.(If the wire is made of the right material, and you make it cold enough,then all of its resistance disappears, and it's called a "superconductor".)
If you have thick and thin wire which will make a generator light up more?
Thicker wire will make the generator light up more because it has lower resistance, allowing more current to flow through and power the generator. Thinner wire has higher resistance and will restrict the flow of current, resulting in less power reaching the generator.
If the voltage is 12 volts and the resistance is 3 ohms what are the amps in this circuit?
Oh, dude, it's like basic math here. So, you just divide the voltage by the resistance to get the current. In this case, 12 volts divided by 3 ohms equals 4 amps. So, the current in this circuit would be 4 amps. Easy peasy lemon squeezy!
Why is the current in an incandescent light bulb greater immediately after it is turned on than it is a few moments later?
The current in an incandescent light bulb is greater immediately after it is turned on because the filament has a lower resistance when it is cold. As the filament heats up, its resistance increases, which reduces the current flowing through the bulb.
How does a battery and foil make heat?
When a battery is connected to foil, the foil can act as a resistor, creating resistance to the flow of electric current and causing a buildup of heat. This heat is generated due to the resistance in the foil which converts electrical energy into thermal energy.
What is added to a circuit to make the current smaller?
The reduction of voltage or the increase of resistance will reduce the current in a circuit.
How much current is need for 12 VDC to flow through water?
First thing voltage does not flow current does. Voltage is the potential or pressure needed to make the current flow. Current is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit. To make the current flow you have to adjust the resistance of the circuit and that would be the water in this case. Salt added to water will make the water conductive so the resistance can be adjusted thereby making the current rise or fall depending on the water solution's resistive properties. The equation that you should consider using is Amps = Volts/Resistance.
What happens to an electric current when the wire is made smaller?
Electric current as we usually describe it is the flow of electrons. Current is caused to flow by voltage, which can be looked at as "electrical pressure" that forces electrons to move. Currents can be made smaller or larger by decreasing the voltage across a fixed amount of resistance. As resistance is the quality of "resisting" or "limiting" current flow, we can change resistance to change current. For a give voltage, if we increase the resistance, we can make the current smaller, and if we decrease it, we can make current larger. In electronics, voltage equals current times resistance. E = I x R Also true is that current is equal to voltage divided by resistance. I = E/R As current equals volts divided by resistance, if we change one of them without changing the other, current will change. And in increase in voltage (with no change to resistance) will cause current to go up. The opposite is also true. Also, if we increase resistance (with no change in voltage), current will go down. And the opposite is true here, too.
Formula used to find the maximum current that can be carried by a resistor if resistance and wattage rating is known?
Manipulate the following equation, to make I the subject: P = I2R, where P = power, I =current, and R = resistance.
How could two circuits have the same current but different resistances?
The equation, I=V/R (Current = Voltage/Resistance) determines the current, so if you increase both V and R, you will be able to get the same current (with a bit of adjustment to make it exact)example:10 Volts & 2 Ohms resistance = 5 Amps Current20 Volts & 4 Ohms resistance = 5 Amps Current
Why must you make current flow through the meter in order to measure it?
You don't. ...unless you want to directly measure the current in a circuit branch. That's the purpose of an ammeter. You can also use a volt meter if you know the resistance of a resistor in that branch to determine current (assuming DC circuit here) - current = voltage / resistance. This may be more useful for circuitry that is on a breadboard, since inserting an ammeter may not be practical.
How does a rheostat make a current high?
A rheostat is a variable resistor that can increase or decrease the resistance in a circuit. By increasing the resistance in the circuit, the rheostat limits the flow of current, causing it to become higher in the parts of the circuit where the resistance is lower.
Why do solar cells need to lower resistance in the electrical circuits that make up their electronic system?
Reducing the resistance of solar cells increases the output current. Although the voltage remains the same the current is effected due to internal resistance. A reduction in output current can result in lesser diminished functioning in household appliances.
One way to make current is to use a what?
You can apply a potential difference across a wire to cause a current to flow through. Ohm's Law allows you to calculate the amount of current based on the voltage supplied and the resistance of the circuit. I = current V = voltage or potential difference R = resistance I = V/R
What do you mean by 'cold resistance' and 'hot resistance'?
Metals that make up typical resistors (and many other electrical components for that matter) tend to heat up as current flows through them. "COLD" resistance is the resistance before it is operating and "HOT" resistance is the resistance after some operating time has elapsed.
How can convert voltage source into current source?
Take the internal series resistance of the voltage source and make it the internal parallel resistance of the current source. Then compute using Ohm's law the current of the current source to be equal to the maximum current the original voltage source could supply a short circuit load. Note: the two sources are equivalent.
How many volts will it take to make 12amps go through 3 ohms of resistance?
It will take 36 volts to make 12 amps go through 3 ohms of resistance. Ohm's law states that the current in amperes is equal to voltage over resistance.
