The device used to increase or decrease the voltage of an electric circuit is a step up transformer or a step down transformer respectively.
A Variable Resistor
It is called a transformer. No, not the robot type. A transformer increases or deacreases the voltage in an electric current.
The device is called a "variac' and it is a type of transformer. It has a variable voltage ouput.
Dimmer, rheostat or potentiometer are all possibilities.
It is a transformer.
Transformer
Transformer
In an alternating current circuit the voltage can be stepped up ordown efficiently with a transformer.
No. Power is constant. Transformers neither increase nor decrease power, except for minor losses. They increase or decrease voltage, and they decrease or increase current, but the product of voltage and current, i.e. power, remains the same.
Decrease, because W = I (current) x V (voltage), if one increases, the other decreases in proportion to the increase of the other. Ohm's Law states current is directly proportional to the applied voltage and inversely proportional to the resistance of the circuit.
If all environmental conditions remain constant then the resistance will not change appreciably with applied voltage, but the current will increase. An increase in current will raise the temperature of the conductor which will increase the resistance somewhat.
Increase, decrease, or remove the load <<>> Change the voltage and the current will also change in direct proportion, Ohms law.
In an alternating current circuit the voltage can be stepped up ordown efficiently with a transformer.
In an alternating current circuit the voltage can be stepped up ordown efficiently with a transformer.
In an alternating current circuit the voltage can be stepped up ordown efficiently with a transformer.
The device is called a "variac' and it is a type of transformer. It has a variable voltage ouput.
Nothing can change electric current to voltage. You can compare "current " to rate of flow, while "voltage" is the energy level. Transformers can be used to increase or decrease the voltages of alternating current as is done from 'street power' to domestic power.
To increase (current) flow in a circuit you increase voltage (or decrease resistance). Ohm's Law: Current = Voltage divided by resistance
No. Power is constant. Transformers neither increase nor decrease power, except for minor losses. They increase or decrease voltage, and they decrease or increase current, but the product of voltage and current, i.e. power, remains the same.
Electromagnets are never used to increase or decrease the voltage in a circuit. These magnets in conjunction with a rotating device (an armature) can create a voltage but the do not have any effect on a voltage.
That's what "resistance" is all about: reducing the current for a given voltage. In fact, you can DEFINE resistance as voltage divided by current.
Transformers increase and decrease voltage as needed. PLATO
It causes a proportional increase in current.
You can use a transformer to increase the current. Note that this will also decrease the voltage. The total energy will not increase; it will decrease slightly, due to losses in the transformer.