What is the primary function of a step-up transformer?

What is the primary function of a step-up transformer?

• A. To decrease voltage and increase current
• B. To maintain current at a constant level
• C. To increase voltage and decrease current
• D. To isolate circuits from each other

Answer: (C)

The primary function of a step-up transformer is to increase the voltage of an electrical signal while decreasing the current. This process occurs based on the principle of electromagnetic induction and the relationship defined by the transformer’s turns ratio. A step-up transformer has more turns of wire on the secondary coil compared to the primary coil, which allows it to elevate the voltage as energy moves from the primary to the secondary side. When voltage is increased, the current must decrease to maintain the conservation of energy (assuming an ideal transformer with no losses). This means that while the voltage on the secondary side of a step-up transformer is higher than that on the primary side, the amount of current is proportionately lower. This functionality is crucial in electrical transmission, as higher voltages allow for efficient long-distance transport of electricity with reduced energy loss due to resistance in the wires.

The primary function of a step-up transformer is to increase the voltage of an electrical signal while decreasing the current. This process occurs based on the principle of electromagnetic induction and the relationship defined by the transformer’s turns ratio. A step-up transformer has more turns of wire on the secondary coil compared to the primary coil, which allows it to elevate the voltage as energy moves from the primary to the secondary side.

When voltage is increased, the current must decrease to maintain the conservation of energy (assuming an ideal transformer with no losses). This means that while the voltage on the secondary side of a step-up transformer is higher than that on the primary side, the amount of current is proportionately lower. This functionality is crucial in electrical transmission, as higher voltages allow for efficient long-distance transport of electricity with reduced energy loss due to resistance in the wires.