Unit 3 - Electromagnetic Induction

What is the relationship between current and resistance (for a constant voltage)?

• Current is proportional to resistance.

• Current is inversely proportional to resistance.

• Current is proportional to the square of resistance.

• Current is proportinal to the square root of resistance.

In the context of electricity, what is resistance?

• How difficult electrons are to flow in a substance.

• How difficult it is to generate voltage from current.

• The ratio between voltage applied and current generated.

• All of these.

Which of these is a valid form of Ohm's Law?

What is the voltage drop (in volts) of a 10 Ω resistor with 2 A of current running through it?

Mathematical Equivalence

ON

A 9 V battery is connected to three 30 Ω resistors in series. How much current (in amperes) flows through the battery?

Mathematical Equivalence

ON

How much current (in Amperes) is running through the unknown resistor?

Mathematical Equivalence

ON

How much current (in amperes) is running through the battery?

Mathematical Equivalence

ON

Which direction does a magnetic field point?

• The direction of the force on the north side of a magnet.

• The direction of the force on the south side of a magnet.

• The direction of the force on a coil of wire.

• The direction of the force on an electron.

How can you maximize the voltage from a generator?

• Increase the magnetic field strength.

• Increase the change in the magnetic field.

• Increase the internal resistance.

• Align the coil parallel to the magnetic fields.

What is the result of cutting a magnet in half?

• The magnet ceases to function.

• The magnet is split into a north and a south pole.

• Each piece will have its own north and south poles.