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โˆ™ 2008-08-24 06:13:10
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Q: When you stepup ac voltage the current drops.What will happen with CURRENT if DC is stepped up?
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Why not multiply Electrical power with stepup transformers?

Power is not multiplied by the use of a transformer. The voltage can be stepped up, but the current is stepped down at the same time so there is no gain in the power which is voltage times current.

What type of device is used to increase or decrease the voltage of an electric current-?

In an alternating current circuit the voltage can be stepped up ordown efficiently with a transformer.

What type of device is used to increase to decrease the voltage of an electric current?

In an alternating current circuit the voltage can be stepped up ordown efficiently with a transformer.

What is transformar?

A transformer is a device that converts electrical power to a different voltage and current potential. You may have one at your home that converts the 110-120 volt wall output to 6-12 volts. The input voltage is stepped down to a lower voltage; the input current is also stepped up by the same factor as the voltage is stepped down.

Why voltage is stepped up in a power syatem?

Power needs to be transmitted over a long distances. Due to long lengths the IR (Current and resistance) losses occur will be huge and directly proportional to I (current). At higher voltage the current remains low hence IR losses will be less. Hence the voltage is stepped up for transmission purposes.

Why you use ac for transmission?

AC is used for transmission because AC can be stepped up in voltage with a transformer, and then stepped back down at the destination. Since power is voltage times current, a higher voltage requires a smaller current to achieve the same power. Since the current carrying capacity of wires is based on wire size, a smaller wire size can be used to transmit the lower current.

Why is the voltage stepped up before transmission?

Voltage is stepped up during transmission to reduce the power loss during transmission due to resistance. Power is a product of Voltage*Current, and losses due to resistance are directly proportional to the square of the current. Now when we increase the voltage , keeping the power constant, the subsequent current reduces.. thus in turn reducing the transmission losses.

Why you step up or step down voltage why not current?

The current is automatically stepped up or down when the voltge is stepped down or up by a transformer.Most transformers are designed for a constant voltage, and the current varies depending on the load. Current transformers are also made to detect the current in a power cable so that it can be measured.Another AnswerIt's a misconception that transformers step current up or down (with the exception of current transformers, that is!). Transformers step voltages up or down. The secondary current is determined by the load. If there is no load, then there is no secondary current; if there is a heavy load, then there will be a heavy secondary current.The secondary current then determines the primary current, because the primary power must match the secondary power (ignoring losses), so if the secondary current increases, so must the primary current. The current itself isn't stepped up or down. Normal transformers work with constant-voltage supplies and are designed to step the voltage up or down, and the current is incidentally stepped down or up in the same ratio as the voltage.Current transformers are designed to step current up or down (usually down), and are used most commonly to sample the current in power conductors.

What happens to the current if the potential difference is stepped-up in an ideal transformer?

In an ideal transformer, if the voltage is stepped up by a factor of x, then the current is stepped down by a factor of x. The end result is that the power, P=VI, is not changed. Again, this is in the ideal case.

How much current does a flashlight use is it's batteries supply 4.5 volts and it's bulb has a resistance of 9 ohms?

Ohm's Law: Voltage = current x resistance; solving for voltage, current = voltage / resistance.Ohm's Law: Voltage = current x resistance; solving for voltage, current = voltage / resistance.Ohm's Law: Voltage = current x resistance; solving for voltage, current = voltage / resistance.Ohm's Law: Voltage = current x resistance; solving for voltage, current = voltage / resistance.

How are voltage current and resistance related?

According to Ohm's law, voltage is the produce of current and resistance, current is the quotient of voltage and resistance, and resistance is the quotient of voltage and current.

Are high voltage transmission lines 60Hz like the wiring in a house?

Yes, the frequency stays the same. Only the voltage and current change as the voltage is stepped down.

Does voltage remain the same as current moves through a circuit?

Voltage attempts to make a current flow, and current will flow if the circuit is complete. It is possible to have voltage without current, but current cannot flow without voltage. The answer is "yes",voltage remains the same as current moves through the circuit.As the voltage remains constant, current increases in the circuit.

What is the formula for current to voltage to power?

Power = (current) times (voltage)Current = (Power) divided by (voltage)Voltage = (Power) divided by (current)

What is the relationship among voltage current and resistance in a circuit?

Voltage = (current) x (resistance) Current = (voltage)/(resistance) Resistance = (voltage)/(current)

Why Current always lead voltage in AC?

Current does not always lead voltage in AC. In a capacitative load, current will lead voltage, but in an inductive load, current will lag voltage.

What is formula for current?

Current [symbol I] = Voltage / Resistance. Also, Current = Power / Voltage.

Why current leads in capaciter?

Capacitors resist a change in voltage. It takes current to effect a voltage change, resulting in the current "leading" the voltage. Similarly, inductors resist a change in current. It takes voltage to effect a current change, resulting in the current "lagging" the voltage.

How does ac dc power supplies work?

The mains to the house is an alternating current and this high voltage is stepped down using a transformer. The low voltage secondary alternating current is converted to direct current using 4 diodes wired as a bridge rectifier. The 'lumpy' direct current is smoothed using an electrolytic capacitor to smooth the resulting dc. It may need to be voltage regulated if the circuits it feeds are voltage sensitive.

What you consume in home current or voltage?

Power is contituted by both current and voltage So we consume both current and voltage

Is the current produced by voltage or is it viceversa?

Voltage is responsible for the production of current. voltage is the unit of electromotive force which gives the electrons a motion in a definite direction which we call current. voltage can exist without current(i.e. in open ckt.) but current can not without voltage.

How the direction of current is reversed?

The direction of a current depends on the voltage. Changing the voltage will change the current.

Why do transmission lines use alternating current?

Transmission lines use alternating current in order to support stepping-up and stepping-down of the voltage with transformers. Voltage is stepped-up at the power station, sent over the transmission lines, and stepped-down at the receiver. (This is a simplified explanation.) By stepping-up, you reduce the current carrying requirement of the lines, and they can thus be smaller.You could not do this with direct current as transformers only work for alternating current.

Transistor is voltage controlled voltage device or current controlled current device or voltage controlled current device or current controlled voltage device?

transistor is a current controlled device. as the current flows through the base of the transistor , it works like a close switch.

Can there be current without voltage?

No, There can't Be current without voltage