Question

The first strings of holiday lights were manufactured as series circuits. Which explains why this method is no longer used?


A.
In a series circuit, if all lights work the circuit remains open, but if one burns, it closes the circuit.


B.


Lightbulb manufacturers stopped making lightbulbs that could be wired in series.


C.
In order for a series circuit to remain closed, enabling electrons to flow, all lights must work.


D.
Series circuits require more wire to keep electrons flowing between lightbulbs.

Answer 1

@douglaswinslowcooper

Answer 2

For a series circuit, if one of the bulbs burns out, the current stops flowing: ----0-------0--------x-----
sounds like C?

Answer 3

"open" means a break in the cicuit

Answer 4

true because it will only be having one path for the charges to move along.

Answer 5

thx :)

Answer 6

You are very welcome.

Answer 7

okay I have just 2 more questions

Answer 8

Fire away. I have time for at least one more.

Answer 9

kk :)

Answer 10

How does an electric motor convert electrical energy into mechanical energy?




A.
When current flows through the motor, it powers electromagnets in the motor. The movement of the electromagnets turns a rod in the motor, which makes the electrical energy available.


B.
When mechanical energy flows through the motor, it powers electromagnets in the motor. The movement of the electromagnets turns a rod in the motor, which makes the electrical energy available.


C.
When current flows through the motor, it powers electromagnets that are attracted and repelled by the poles of permanent magnets in the motor. The movement of the electromagnets turns a rod in the motor, which makes the mechanical energy available.


D.
When magnetism flows through the motor, it powers electromagnets that are attracted and repelled by the poles of permanent magnets in the motor. The movement of the electromagnets turns a rod in the motor, which makes the mechanical energy available.

Answer 11

It is either A or C, as the current is causing a magnetic field.
They sound somewhat alike, but C seems correct. We need electromagnets interacting with permanent magnets.

Answer 12

One more.

Answer 13

so just to be sure is it A or C?

Answer 14

C

Answer 15

Based on the diagram, why does the lightbulb light when the loop rotates, and what is the energy change involved?




A.
When the wire moves in an electric field, electrons in the wire move and become mechanical energy. The mechanical energy causes the light to glow. Electrical energy used to rotate the loop is converted to light energy.


B.
When the wire moves in a magnetic field, electrons in the wire move and become an electric current. The current causes the light to glow. Mechanical energy used to rotate the loop is converted to electrical energy.


C.
When the wire moves in a magnetic field, electrons in the wire move and become an electric current. The current causes the light to glow. Mechanical energy used to rotate the loop is converted to light energy.


D.
When the wire moves in an electric field, electrons in the wire move and become mechanical energy. The mechanical energy causes the light to glow. Mechanical energy used to rotate the loop is converted to electrical energy.

Answer 16

B and C are nearly the same. Is light a form of energy? Yes.

Answer 17

i'm a little confused, which is the answer ?

Answer 18

Sorry to confuse you. We try not to give answers, but sometimes that is the only way to help. In A it says currents are mechanical energy, which is wrong. In B it ends at electrical energy, but we need to end with light. In C, my choice, we do end up with light. In D, we do not end up with light.

Good night.

Answer 19

thank you very much and Good Night to you too :)

Answer 20

um... since ur still here, could you please this last one *puppy face*
What causes a magnetic field to form around certain metals, such as iron?


A.
The majority of the atoms have been acted upon by gravity.


B.
The majority of the domains are aligned.


C.
The majority of non-metal atoms are aligned.


D.
The majority of the protons are aligned.

Answer 21

is it A?