Exploring Current and Magnetism (20 Do Now)

What is the primary function of a transformer in electrical circuits?

• To convert electrical energy into mechanical energy

• To change the voltage level of an alternating current

• To store electrical energy

• To convert direct current to alternating current

Which of the following is a key component of a transformer?

• Commutator

• Rotor

• Stator

• Core

What is the relationship between current and magnetic field in a wire?

• Current creates a magnetic field around the wire

• Magnetic field creates current in the wire

• Current and magnetic field are unrelated

• Current destroys the magnetic field

In a transformer, if the primary coil has 100 turns and the secondary coil has 200 turns, what is the type of transformer?

• Step-up transformer

• Step-down transformer

• Isolation transformer

• Auto transformer

Which law explains the induction of current due to a changing magnetic field?

• Ohm's Law

• Faraday's Law of Electromagnetic Induction

• Coulomb's Law

• Newton's Third Law

What is the formula for calculating the magnetic force on a current-carrying wire in a magnetic field?

Which of the following devices uses the principle of electromagnetism to function?

• Battery

• Light bulb

• Electric motor

• Solar panel

What happens to the magnetic field strength if the current through a wire is doubled?

• It remains the same

• It is halved

• It is doubled

• It is quadrupled

Which of the following is NOT a factor affecting the induced electromotive force (emf) in a coil?

• Number of turns in the coil

• Strength of the magnetic field

• Speed of the change in the magnetic field

• Color of the coil

What is the unit of magnetic field strength?

• Tesla

• Newton

• Joule

• Watt