Current through a lamp is 0.55 A and voltage is 120V, how much resistance does the lamp have?
What is 120/.55=218.18 ohms
100
What is a circuit?
What is a continuously flowing closed loop
100
What kind of wire (describe length and width) has the LEAST resistance and what kind of wire has the MOST resistance?(not type copper/gold....)
What is Least resistance is short, thick metal wire, and Most resistance is long, narrow, metal wire
100
What is the difference between and electric field and static charge?
What is an electric field is a field where electric charges are exchanged with another charge at a distance. Static charge is a buildup of electric charge on an object.
100
Why are atoms normally electrically neutral?
What is they have equal numbers of electrons and protons.
200
A wire with resistance 10 ohms is attached to a 20V battery, how much current is flowing?
What is 20/10 = 2 amps
200
What is the difference between a series circuit and parallel circuit?
What is series circuit has only one path for the current to follow. Parallel circuit has two or more separate paths for the electrons to follow.
200
What is the difference between resistance and voltage?
What is resistance is the measure of how difficult it is for electrons to flow through a material and voltage is how much electric energy is in an object.
200
Why do protons not move to change the charge of an atom?
What is the strong nuclear force in the center of an atom is more than the electron force. So the protons are held in the nucleus while the electrons can move with little resistance.
200
What is an electric current?
What is the steady flow of electrons through a conductor.
300
If you use 2100W of power from a socket with 120V what is the current flowing?
What is 2100/120 = 17.5 amps
300
If a circuit is connected battery to wire, to two wires connected separately to 2 different lightbulbs, connected to wire connected to battery. What kind of circuit is it?
What is parallel
300
Compare an electric current to water flow (remember figure in book).
What is Both can do work (both have potential energy), the amount of potential energy of both can vary (water based on height of flow, electric current based on type of chemical reaction). To flow continuously, both must flow through a closed loop.
300
How does the electrical charge of an atom occur (what moves) and why?
What is electrons move from one atom to another, making some atoms have a negative charge and some have a positive charge.
300
What units do electric companies usually sell energy in?
What is kilowatt-hours (kW/Hr)
400
If you have an average of 0.8 A of current operated on a 160-V outlet, what is the power usage?
What is .8x160 = 128 watts
400
If a circuit is connected as follows: Battery, wire, lightbulb, wire, lightbulb, wire, lightbulb, battery. Is it series or parallel?
What is series
400
What kind of metal do we use in lightbulbs and why?
What is tungsten, because it has a high resistance and produces a bright light as the current passes through it.
400
How does "grounding" protect us?
What is Grounding causes excess charge to drain into the earth which can absorb the excess charge because it is so large.
400
What is the difference between insulators and conductors?
What is insulators are material where electrons cannot move easily from place to place and conductors are materials that allow electrons to flow easily through them
500
If you have a resistance of .30 attached in a circuit with a current of 40. How much power is needed to run the load?
What is .3x40=12 and 12x40=480 watts
500
How can you tell if Christmas lights are in series or parallel circuits?
What is in a series circuit if you remove one lightbulb ALL of the lightbulbs will go out, in a parallel if you remove one lightbulb the remaining lightbulbs will stay on.
500
What happens to the current if the resistance decreases and the voltage stays the same?
What is the current increases (Ohm's law) V=IxR or I=V/R
500
Why are there 2 terminals on a battery, could a battery work with only 1? Explain.
What is the positively charged atoms collect at the positive end and the electrons collect at the negative end. If there was only 1 then the charges would stay together and not separate and there would be no voltage.
500
List 3 conductors and 3 insulators.
What is conductors: copper, silver, gold, iron (metals) insulators: plastic, wood, glass, rubber, fabric