Magnetism 3

What is the primary factor that affects the size of the voltage induced in a conductor moving through a magnetic field?

• The speed of the conductor's movement

• The length of the conductor

• The temperature of the conductor

• The colour of the conductor

Which of the following describes the generation of electricity by rotating a magnet within a coil of wire?

• Static electricity

• Electromagnetic induction

• Thermal conduction

• Chemical reaction

What is the main purpose of a transformer in electrical circuits?

• To convert electrical energy into mechanical energy

• To change the size of an alternating voltage

• To store electrical energy

• To measure electrical current

In a transformer, what does the turns ratio between the primary and secondary coils determine?

• The frequency of the output voltage

• The efficiency of the transformer

• The voltage change between input and output

• The resistance of the coils

Which of the following is a use of step-up transformers in the transmission of electrical energy?

• To decrease the voltage for household use

• To increase the voltage for long-distance transmission

• To convert AC to DC

• To store electrical energy

What is the relationship between input power and output power in a 100% efficient transformer?

• Input power is greater than output power

• Input power is less than output power

• Input power equals output power

• Input power is unrelated to output power

Which equation represents the relationship between primary and secondary voltages and turns ratio in a transformer?

What happens to the voltage when a step-down transformer is used?

• The voltage increases

• The voltage decreases

• The voltage remains the same

• The voltage is converted to current

Which factor does NOT affect the size of the induced voltage in a coil of wire?

• The number of turns in the coil

• The strength of the magnetic field

• The speed of the magnetic field change

• The colour of the wire

In the context of transformers, what does the term "efficiency" refer to?

• The ability to store energy

• The ratio of output power to input power

• The speed of voltage transformation

• The size of the transformer