Insulators/Conductors
What are some examples of insulators?
Plastic, wood, air, rubber, and glass?
In the equation V=IR, what is I measured in?
Amps
Who won the war of the currents? How do we know?
Tesla, because we have used his idea for the most efficient means of moving electricity from the power plant to our houses.......AC Current
True or False: The electromagnetic force is one of the four fundamental forces of nature.
True
Which type of circuit could a light bulb go out while all of the other bulbs remain on?
Parallel Circuits
What are some examples of conductors?
Metals (especially copper in wires) and skin.
An electric toothbrush operates on 120 V and has a current of 12.5 amps. What is its resistance?
9.6 Ω
What type of current do batteries product?
DC or Direct Current
An electromagnet is a magnet that works
-A. only with the help of electricity, B. permanently, C. only when it is made a part of the circuit, OR D. both A & B
A. only with the help of electricity
Why does a light bulb remain on when one goes out in a parallel circuit?
It has more than one "path" for current to flow from the positive to the negative terminal without any gap.
What part of a wire is the insulator? Which is the conductor?
Insulator= rubbing outside part of the wire
Conductor= metal wire inside
Calculate the current produced with a 9 V battery through a resistance of 100 ohms?
0.09 amps
Is Electricity Used in the Human Body?
Yes, electricity is required for the nervous system to send signals throughout the body and to the brain.
What will increase the strength of the magnetic field around a current?
-A. Increasing the current, B. moving further from the current, OR C. switching the current off-
A. Increasing the current
What type of current flows from any electrical outlet?
AC Alternating Current
Name 3 factors that increase resistance?
1. Increased Heat
2. Longer length wires
3. narrower wires
4. materials with a structure that has tiny amounts of air between their molecular structure.
What is the Ohm's Law?
the amount of current is directly proportional to the voltage difference.
How Is Electricity Used?
Lighting, heating, cooling, operating, machinery, etc.
What is electromagnetism?
an interaction that occurs between particles with electric charge via electromagnetic fields.
Do series circuits or parallel circuits have a voltage that stays the same throughout?
Parallel Circuits
At the molecular level why are metals good conductors?
Their molecular structure is uniformed and tightly bound together so the current can move easily through it as opposed to having to "jump" gaps between particles.
The lower the resistance, the higher the ____.
current
What is voltage?
an electromotive force or potential difference expressed in volts.
Which of the following does not increase the strength of the magnetic field produced by an electromagnet?
-A. Increasing the electric current flowing in the coil,
B. increasing the number of turns on the coil
C. using a copper core
C. Using a copper core
True or False: More items increases the overall resistance in parallel circuits.
False