**Contents**show

## Why voltage is inversely proportional to current in transformer?

The equation, i = v/r, says us that the current, i, flowing through a circuit is directly related to the voltage, v, and inversely related to the resistance, r. Conversely, **if we increase the voltage**, then the current will increase. … So, the current is inversely related to the voltage.

## What is the relationship of voltage and current?

The relationship between voltage, current, and resistance is described by Ohm’s law. This equation, **i = v/r**, tells us that the current, i, flowing through a circuit is directly proportional to the voltage, v, and inversely proportional to the resistance, r.

## How do you calculate the output voltage of a transformer?

**Divide the number of secondary windings by the number of primary windings, and multiply the source voltage by this ratio**. This will give you the output voltage.

## Why does current decrease when voltage increases in a transformer?

A transformer transfers power from the primary coil to the secondary coil. Since the power must stay the same, if the voltage increases, the current must decrease. … That’s because it’s **the change of the magnetic field created by the primary coil that induces voltage** in the secondary coil.

## How do you calculate input and output voltage?

**Input and output power**

- Electrical power is calculated by multiplying voltage (in volts) by current (in amps).
- If a transformer is 100% efficient, then the input power will equal the output power. …
- V
_{P}is input (primary) voltage. - I
_{p}is input (primary) current. - V
_{s}is output (secondary) voltage.

## How do you calculate current in a transformer?

If for some reason you need a larger transformer to operate appliances, you still **divide the wattage by the voltage to** find the current. For a 120-volt primary, 2000-watt transformer, divide 2000 by 120 for the current (2000 Watts /120 volts =16.67 amps). For a 240-volt, 3000-watt transformer, the current is 12.5 amps.

## How does a transformer increase voltage?

A transformer converts alternating current (AC) from one voltage to another voltage. It has no moving parts and works on a magnetic induction principle; it can be designed to “step-up” or “step-down” voltage. So **a step up transformer increases** the voltage and a step down transformer decreases the voltage.

## How do you calculate voltage output?

The current flowing out of the power supply is just the **voltage (5 volts) divided by total resistance, I=V/R**, so: I=5R+RLED.

## Is voltage and current inversely proportional?

The relationship between current, voltage and resistance is expressed by Ohm’s Law. This states that the current flowing in a circuit is directly proportional to the applied voltage and **inversely proportional to the resistance of the circuit**, provided the temperature remains constant.

## Is voltage and current directly or inversely proportional?

**Current is directly proportional to the voltage**. A fourfold increase in the voltage would cause a fourfold increase in the current.

## When voltage increases what happens to current?

Ohm’s law states that the electrical current (I) flowing in an circuit is proportional to the voltage (V) and inversely proportional to the resistance (R). Therefore, if the voltage is increased, the current will **increase provided the resistance of the circuit does not change**.