Electricity and Magnetism Study Guide

As electrons flow through a circuit, the voltage remains constant. What happens to the flow of electrons, or current, if the resistance increases?

• The current decreases so the electrons would slow down

• The current stays the same so the electron flow would stay constant

• The current increases so the electrons would speed up

• The current increases so more electrons would flow through the circuit

Three circuits each have the same exact components except for the battery. Circuit #1 has a 6 volt battery, Circuit #2 has a 9 volt battery. Circuit #3 has a 12 volt battery. Which of the following statements describes how voltage, current, and resistance are related by Ohm’s Law in these circuits?

• As voltage increases, current decreases and resistance decreases.

• As voltage increases, current increases and resistance stays the same.

• As voltage increases, current decreases and resistance stays the same.

• As voltage increases, current stays the same and resistance decreases.

Which material below has the lowest electrical resistance?

• Wood

• Copper

• Rubber

• Water

If you decrease the voltage in a circuit, what will happen to the current if resistance stays the same?

• The current will decrease

• The current will increase

• The current will stay the same

• The current first decrease, then increases

How should you wire four bulbs in a circuit so that all bulbs will shine as brightly as possible?

• in parallel

• in a series

• with no switch

• in an open circuit

In the diagram, which of the following bulbs will go out if the switch is opened?

• Only Bulb A

• Only Bulbs A and B

• Only Bulbs B and C

• All bulbs will go out.

Tags

NGSS.MS-ETS1-1

When an electrician wires a house or a building that will be using lights in several rooms, appliances, air conditioner/heater, or any other electrical device, which type of circuits are used?

• series circuits

• parallel circuits

• direct circuits

• alternating circuits

The diagram above represents a circuit with 3 light bulbs. If the middle bulb burns out, what happens to the other bulbs?

• The other 2 bulbs will keep working.

• The first bulb will work but the last bulb will not work.

• None of the bulbs will work.

Tags

NGSS.HS-PS3-5

What happens to the brightness of the bulbs of a circuit wired in series if more bulbs are added?

• The bulbs get brighter

• All the bulbs get dimmer

• The bulbs stay the same brightness

• The bulbs how zero current and go out

What type of current travels in only one direction?

• Series current

• Parallel current

• Direct current

• Alternating current