Question 11pts

Question 1

In an ac circuit, the current

Group of answer choices

is nonexistent.

increases via the inverse square law.

none of these

changes magnitude and direction with time.

is the same everywhere.

Question 2

When a 10-V battery is connected to a resistor, 2 A of current flow in the resistor. What is the resistor's value?

Group of answer choices

5 ohms

2 ohms

10 ohms

more than 20 ohms

20 ohms

Question 3

If you plug an electric toaster rated at 110-V into a 220-V outlet, current in the toaster will be about

Group of answer choices

half what is should be.

the same as if it were plugged into 110-V.

twice what it should be.

more than twice what it should be.

Question 4

Is this circuit a parallel or series circuit?

Group of answer choices

Series

Parallel

Question 5

Which direction is the electron current flowing in the battery?

Group of answer choices

up

right

down

left

Question 6

The resistors are the same. What is the current through each of the resistors?

Group of answer choices

5 Amps

10 Amps

20 Amps

0 Amps

Question 7

Which of the following situations is the most dangerous for humans?

Group of answer choices

A high voltage for a short time

A high current for a long time

A high voltage for a long time

A high current for a short time

Question 8

Is this circuit series or parallel?

Group of answer choices

series

parallel

Question 9

What is the current through the battery?

Group of answer choices

0.5 A

2 A

1 A

4 A

Question 10

What is the power of the battery?

Group of answer choices

3 W

36 W

12 W

6 W

Question 11

Which of the resistors is heating up with the most power?

Group of answer choices

2 Ohm

1 Ohm

3 Ohm

They are all the same power because they all have the same current!

Question 12

Does a battery that you buy from the store provide DC or AC voltage?

Group of answer choices

AC

DC

Question 13

The wall outlets that you plug your cell phone charger into, are they AC or DC voltage sources?

Group of answer choices

AC

DC

Question 14

Multiple answers alert. Choose all the correct answers for full credit.

Why are LED light bulbs desired over the the alternatives like tungsten filament (the original technology for electric light bulbs) or compact fluorescent light bulbs?

Group of answer choices

LED lightbulbs put out a lot of heat which makes them very nice to use when it's cold outside.

Although LEDs may be more expensive per bulb, LED light bulbs last for such a long time that they prove to be more economical in the long run.

LED light bulbs provide the same light output brightness for much less electric power leading to cheaper electric bills.

Question 15

What is physically wrong with saying, "Charge up the cell phone battery"?

Group of answer choices

There is nothing wrong with saying, "Charge up the cell phone battery". This is physically what we must do in order for the cell phone to be able to use the extra electric charge in the battery.

Actually what is happening is we need to add electrons to the battery. Since electrons are negatively charged this is a "Charge down" of the battery.

The goal is not to change the electric charge of a cell phone battery; the goal is to re-energize the battery.