Electromagnetism Quiz

What is the primary function of an electric generator?

To convert mechanical energy to electrical energy

Which of the following does NOT affect the EMF of a wire moving in a magnetic field?

The diameter of the wire in the field

When is the current zero in an electric generator?

When the wire segments move perpendicular to the field

What is the main difference between an electric generator and an electric motor?

The direction of energy conversion Signup and view all the answers

What is the effective voltage for most household wall outlets in the United States?

120 V Signup and view all the answers

What happens to the mechanical energy in an electric generator?

It is converted to electrical energy Signup and view all the answers

What happens to the current in the loop when it is in the vertical position?

It decreases to zero Signup and view all the answers

How often does the direction of the current in the loop change?

Each time the loop turns through 180° Signup and view all the answers

What is the primary function of a generator?

To convert mechanical energy to electrical energy Signup and view all the answers

What happens to the current in the loop as it rotates?

It alternates between zero and some maximum value Signup and view all the answers

What is the product of in a generator?

Current and voltage Signup and view all the answers

What is the purpose of the brush and slip-ring arrangement?

To allow the armature to turn freely while passing current into the external circuit Signup and view all the answers

What is the relationship between the average power PAC and the maximum power Pmax?

PAC = ½Pmax Signup and view all the answers

How is the effective current Ieff related to the maximum current Imax?

Ieff = 0.707Imax Signup and view all the answers

What is the frequency of voltage oscillation in the United States?

60 Hz Signup and view all the answers

What is the relationship between the effective voltage Veff and the maximum voltage Vmax?

Veff = 0.707Vmax Signup and view all the answers

What is the formula to express the average power PAC in terms of effective current Ieff and resistance R?

PAC = Ieff^2R Signup and view all the answers

What is the value of effective voltage Veff in a typical US wall outlet?