Electricity and magnetism

Resistance is measured in units of

• amps

• volts

• watts

• ohms

Magnetic force

• is strongest near a magnet's poles

• is a field force

• acts at a distance

• all of the above

Which of the following does NOT increase resistance?

• increasing the temperature

• increasing the diameter

• lengthening the wire

Which is a true statement about a series circuit?

• All the current flows through every part of the circuit

• Every part of the circuit is positively charged

• The current through the circuit can take several paths

• Every part of the circuit is negatively charged

A flashlight bulb connected to a 6-V battery draws a 0.5 current. What is the power used by the flashlight bulb?

• 3 W

• 12 W`

• 1.25 W

• 6.5 W

Transformers can

• increase voltage

• decrease voltage

• neither increase nor decrease voltage

• increase or decrease voltage

What will happen if you add bulbs to a series circuit?

• The voltage increases

• The current increases

• The resistance increases

• The resistance decreases

When a glass rod is rubbed with silk and becomes positively charged,

• electrons are removed from the rod

• protons are added to the silk

• protons are removed from the silk

• the silk remains neutral

Objects X and Y are rubbed together. Object X acquires a negative charge, What does object Y experience?

• A gain of protons

• A loss of protons

• A loss of electrons

• A gain of electrons

A generator converts mechanical energy into electrical energy by using a conducting loop turning in a

• copper sphere

• gravitational field

• magnetic field

• steel sphere