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What is the power when a voltage of 120 V drives 2A current through a device?
Wiki User
∙ 7y ago
Volts * Amps = Watts
in this case
120 Volts * 2 Amps = 240 Watts
This is true for a pure resistive load. If not the result must be multiplied by a Power factor that is between 0 and 1.
240 watts
Wiki User
∙ 10y ago
Wiki User
∙ 9y agoThe equation that you are looking for is W = Amps x Volts.
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120 v times 0.2 amps is 24 watts.
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What type of input device uses the principle of magnetic induction to produce a voltage signal?
Hard Drives Floppy Drives Tape Drives Drum Drives
What is the meaning of 'voltage drives current'?
Think of Voltage as the pressure and Amperage (current) as flow. If you think of it as pipes with water then the pressure would be voltage, and current would be how much water flows past a certain point in the pipe in a given time.
What is the relationship between voltage and current and resistance in a simple circuit?
The simplest way to understand it is to use Ohm's law: E = IR. Voltage (E) can be though of as pressure that drives the current. Voltage is measured in volts. Current (I) can be thought of as the actual flow of electrons within the circuit. Current is measured in amperes, or amps. Resistance (R) can be thought of as exactly that - the amount of opposition to current flow in a circuit or component. Resistance is measured in ohms. So let's see how this works. E = IR. If E is constant (typical for a battery) then the current (I) is equal to the voltage divided by the resistance. Let's use a voltage of 12 volts, and a resistance of 2 ohms. The current is I = 12 volts/2 ohms= 6 amps. If you remember Ohms law, you can predict what will happen in simple circuits using only a little bit of simple algebra. What is arguably the simplest form of this relationship is that a 1 volt source connected to a 1 ohm resistor will cause 1 amp of current to flow. There are other ways to say the same thing. A 1 ohm resistor with 1 amp of current flowing through it must be connected to a 1 volt source. A 1 volt source that causes 1 amp of current flow must be connected to a 1 ohm resistance.
What is the difference between potential difference and current?
think of potential as pressure and current as flow. you can have pressure in a water hose with out flow. open the valve and current happens. The difference in potential divided by the impedance is equal the current.
Why does the speed of the DC series motor rise to a run away condition if full voltage is applied while there is no load?
At no load, the speed of a series motor rises to a run-away condition if the full voltage is applied because the applied voltage appears directly at the terminals of the motor and drives it to a run-away condition since speed is proportional to the voltage.
What is the value of a resistance if 20v drives 2a through it?
Simply divide the voltage by the current. This means you apply Ohm's Law.
What is the power when a voltage of 120V drives a 2-A current through a device?
Power is volts time amps, so 120 V time 2 A = 240 W. That is, of course, assuming that the voltage is DC, or the load is purely resistive. If there is any capacitive or inductive reactance in the device, and the voltage is AC, the true power will not be equal to the apparent power because of a phenomenon called power factor due to phase angle of voltage not being equal to current.
What must voltage be?
Voltage is a measure of the E.M.F (electromotive force) which drives current around a circuit.
What type of input device uses the principle of magnetic induction to produce a voltage signal?
Hard Drives Floppy Drives Tape Drives Drum Drives
What is more is correct v is proportional to i or i is proportional to v?
The induced current is proportional to applied voltage. i is proportional to v Or you might say, "A current source drives a fixed current through a circuit. Then the voltage developed is proportional to i" . Both forms are equally correct. Voltage sources are more common than current sources so the first form is more common.
What is the meaning of 'voltage drives current'?
Think of Voltage as the pressure and Amperage (current) as flow. If you think of it as pipes with water then the pressure would be voltage, and current would be how much water flows past a certain point in the pipe in a given time.
In an electric circuit what provides the push?
You could consider the Voltage as the pushing force in a circuit. It drives the current.
What is voltage?
A type of "pressure" that drives electrical charges through a circuit. Voltage is how the electric potential energy differences are measured.
Whether high impedance drives the currecnt or voltage more?
No, This will act in reverse.Note: This will act only for alternating current and there will be no effect on direct current.
How does connecting an electric device to a battery produce an current in the device?
If we connect a battery to a device and complete a circuit, current will flow in that circuit and through the device. A battery (in good condition) is an electrical storage device. Most of the ones we are familiar with are chemical cells. There are chemicals inside that would like to react, but cannot unless there is an external circuit through which electrons can move to get from one electrode in the battery to the other. The potential chemical energy in a battery can be converted into electrical energy by completing that circuit. There is a force called voltagethat arises between the electrodes of the battery. And this voltage (electromotive force, or EMF) is the way that the chemical potential energy expresses itself. Because the battery can convert chemical potential energy into electricity owing to that EMF between the electrodes, connecting a circuit across the battery will allow current to flow as the chemical reactions in the battery proceed. A very rough analogy can be drawn by looking at gravitational potential energy. If a bowling ball is sitting on the floor and it is lifted onto a table, its gravitational potential energy has been increased. This is distantly similar to the chemical reactions that want to occur in the battery; they are potential energy, too. If the bowling ball rolls off the edge of the table, the potential energy is converted into kinetic energy by gravity. When we hook up an external circuit to the battery, the chemical potential energy (expressed as voltage) drives electrical current through that circuit and the device in it. The circuit here is composed of conductors and the device. Electrons in the conductors are hanging around in the conduction band, and if a voltage is applied, those electrons will begin moving in response. The device must be conductive to some extent, and it, too, will have this electron current flowing through it. The battery has been connected to a circuit and drives current through that circuit. The chemical potential energy in the battery is converted into electrical energy in the circuit and the device connected to it.
How connecting an electric device to a battery produces a current in the device.?
If we connect a battery to a device and complete a circuit, current will flow in that circuit and through the device. A battery (in good condition) is an electrical storage device. Most of the ones we are familiar with are chemical cells. There are chemicals inside that would like to react, but cannot unless there is an external circuit through which electrons can move to get from one electrode in the battery to the other. The potential chemical energy in a battery can be converted into electrical energy by completing that circuit. There is a force called voltagethat arises between the electrodes of the battery. And this voltage (electromotive force, or EMF) is the way that the chemical potential energy expresses itself. Because the battery can convert chemical potential energy into electricity owing to that EMF between the electrodes, connecting a circuit across the battery will allow current to flow as the chemical reactions in the battery proceed. A very rough analogy can be drawn by looking at gravitational potential energy. If a Bowling ball is sitting on the floor and it is lifted onto a table, its gravitational potential energy has been increased. This is distantly similar to the chemical reactions that want to occur in the battery; they are potential energy, too. If the bowling ball rolls off the edge of the table, the potential energy is converted into kinetic energy by gravity. When we hook up an external circuit to the battery, the chemical potential energy (expressed as voltage) drives electrical current through that circuit and the device in it. The circuit here is composed of conductors and the device. Electrons in the conductors are hanging around in the conduction band, and if a voltage is applied, those electrons will begin moving in response. The device must be conductive to some extent, and it, too, will have this electron current flowing through it. The battery has been connected to a circuit and drives current through that circuit. The chemical potential energy in the battery is converted into electrical energy in the circuit and the device connected to it.
How voltage become zero in centre point?
If you have an alternating current, which changes direction, and we graph the direction in terms of positive and negative, then at some point, as the current changes from positive to negative, and from negative to positive, it must pass through zero. If you imagine a car, driving forwards, that then changes direction and drives in reverse, there must be a point when it is not moving. Changes of direction, or voltage, are not instantaneous.
