Understanding Electricity Transmission and Transformers

Why is electricity transmitted at high voltages?

• To decrease the cost of pylons

• To make the cables lighter

• To increase the brightness of bulbs

• To reduce energy loss over long distances

What does the dimmer bulb in the demonstration represent?

• A home close to the power station

• A home far from the power station

• A faulty bulb

• A bulb with higher resistance

What is the purpose of using a multimeter in the demonstration?

• To measure the current in the circuit

• To measure the resistance of the bulbs

• To measure the voltage across different points

• To measure the power consumption

How do transformers help in power transmission?

• By stepping up and stepping down the voltage

• By increasing the power

• By increasing the current

• By reducing the resistance

What is the turns ratio of the transformer used in the demonstration?

• 25 to 1

• 20 to 1

• 15 to 1

• 10 to 1

What happens to the brightness of the bulbs when transformers are used?

• Both bulbs become brighter

• Both bulbs become dimmer

• The bulb far from the power station becomes brighter

• The bulb close to the power station becomes dimmer

What is the voltage at the far end of the circuit after using transformers?

• 42.5 volts

• 1.9 volts

• 2 volts

• 0.8 volts

Why is it important to use a low voltage supply in the demonstration?

• To prevent overheating of the wires

• To ensure safety during the demonstration

• To reduce the cost of the setup

• To make the bulbs brighter

What should be the maximum voltage after stepping up in the demonstration?

• 50 volts

• 30 volts

• 40 volts

• 20 volts

What is crucial to ensure when setting up the transformers?

• That they are connected in series

• That they are connected in parallel

• That they are the right way round for stepping down

• That they are placed close to each other