Energy Lessons 4-5

Question 1

Which side of a dry cell has fewer volts? Which has more?

Answer 1

The positive side has less volts and the negative side has more

Question 2

What is measured with a voltmeter?

Answer 2

The potential difference between two places

Question 3

What is the unit of measurement of potential difference?

Answer 3

A volt

Question 4

What is potential difference?

Answer 4

The difference between the number of electrons flowing in the positive side compared to the amount flowing in the negative side

Question 5

What does a simple circuit include?

Answer 5

One light bulb, one dry cell, and one switch

Question 6

What turns the circuit on?

Answer 6

Closing the switch

Question 7

What turns the circuit off?

Answer 7

Opening the switch

Question 8

Which side is the red test lead always supposed to be on?

Answer 8

The positive side

Question 9

Which side is the black test lead always supposed to be on?

Answer 9

The negative side

Question 10

What is the voltage reading on the batteries?

Answer 10

1.5 volts

Question 11

What do the dry cells at as?

Answer 11

They act as electrical pumps to provide the energy to move the charges in the circuit

Question 12

What is used to measure voltage?

Answer 12

A voltmeter

Question 13

What kind of circuit is this?

Answer 13

A parallel circuit

Question 14

When dry cells are connected in a parallel circuit, does the voltage increase or stay the same? What about the brightness?

Answer 14

Both stay the same

Question 15

When dry cells are connected in a series circuit does the voltage increase our stay the same? What about the brightness?

Answer 15

Both increase

Question 16

What type of energy is used by solar cell?

Answer 16

Radiant energy

Question 17

What can magnetic forces cause?

Answer 17

They can cause electricity to move through copper wires

Question 18

Do all the magnets face the same direction as they hang from the thread?

Answer 18

Yes they all face the same direction because one direction is north and one is south, so they are attracted to the north pole

Question 19

What is a rule for the behavior of two magnets?

Answer 19

Like poles repel and unlike poles attract

Question 20

What is voltage?

Answer 20

The term scientists use to describe the push that cause electrons to move through a circuit

Question 21

How are electricity and magnetism related?

Answer 21

An electric wire can cause a disruption in a magnet’s magnetic force and makes the magnet move with the current electricity

Question 22

How does a generator work?

Answer 22

The generator consists of powerful magnets surrounded by coils of copper wire. As the shaft rotates, the magnet turns inside the wire coil, producing an electric current. The electric current flows through power lines to homes and industries.

Question 23

Why are the currents in our houses alternating currents?

Answer 23

It is called alternating current because the wires are passing through the north and south poles of the magnet (or the magnet is rotating within the copper coil), this causes the electric current to reverse its flow (or alternate) on a regular basis.

Question 24

How does a water/wind turbine work?

Answer 24

The turbine can be a windmill or a water wheel which moves in a rotating motion (mechanical energy) to spin the magnet. The magnetic forces cause the electrons in the copper wire to move about. This moving of electrons creates electricity (electrical energy). The alternating current that is produced by the generator is then sent out into the community through wires to be used in places such as houses, schools, and businesses.