Inductance

Choose the situation in which the magnitude of EMF generated by the inductor would be maximum.

• Current is increasing rapidly in the circuit.

• A constant small current is flowing in the circuit.

• Current is decreasing slowly in the circuit.

• A constant large current is flowing in the circuit.

Tags

NGSS.HS-PS2-5

Which of these best describes the effect of the inductor in the circuit after the switch is closed?

• Behaves like a connecting wire and does not affect the flow of current.

• Initially opposes the flow of current, later behaves like a connecting wire

• Permanently blocks the flow of current in the circuit.

• Provides constant opposition to the flow of current.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

The fact than an inductor opposes any change in current is true of:

• AC signals only

• DC signals only

• AC and DC signals

• None

Tags

NGSS.HS-PS2-5

Choose factor can change the value of inductance

• Value of current

• Battery or power supply

• Length of the wire
• Number of turns in the coil

Mutual Inductance is

• the phenomenon where a changing current in one coil induces a voltage in another coil
• the resistance in a circuit due to mutual inductance
• the ability of a material to store electrical energy
• the process of converting electrical energy into mechanical energy

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Which statement is TRUE about Mutual inductance?

• The first and second coil does not have power supply  

• The second coil has more turns than the first coil

• The second coil does not have any connection to power supply

• The first coil will not induced an emf

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What is purpose of inductance in circuit

• Inductance is used to convert electrical energy into mechanical energy
• Inductance in a circuit is used to store energy in the form of a magnetic field and helps stabilize and control the flow of electricity.
• Inductance is used to increase resistance in a circuit
• Inductance is used to generate heat in a circuit

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

The way to reduce energy lost in transmission cable is

• Use thicker cables
• Keep voltage and current constant
• Increase voltage and decrease current
• Decrease voltage and increase current

The _______ the number of turn of primary coil than secondary, the ______ the value of current in secondary coil than primary.

• greater, smaller

• greater, greater

• smaller, smaller

• smaller, greater

Answer explanation

If N1 < N2 then V1 < V2.
So I1 > I2.

Calculate potential difference in the secondary coil based on the information given below.

Vp = 240 V

Np = 20

Ns = 125

Vs ?