Show:
Positive/Negative Charge
Current/Voltage Difference and Batteries
Resistance/Simple Circuit Current
Series/Parallel Circuits
Household Circuits/Electrical Power
100
Subatomic particle with positive charge
Proton
100
Net movement of electrical charges in a single direction
Electric current
100
What is resistance?
Tendency of a material to oppose the flow of electrons, changing electrical energy into thermal energy and light
100
What is a series circuit?
Circuit where the electrical current has only one loop to flow through
100
Name one thing that prevents wires from overheating.
Circuit breaker OR fuse box
200
accumulation of excess charge on an object
Static electricity
200
How is the flow of electrical charges similar to the flow of water?
They both travel from high pressure areas to low pressure areas.
200
Which material is best for conducting and has low resistance?
Copper
200
What causes an open circuit?
When a part of a series circuit is disconnected
200
How does a fuse work?
When a current becomes too high, a small piece of metal melts. When the metal melts, it breaks the circuit.
300
electric field
surrounds an electric charge
300
A closed path that electric currents follow is a _______
Circuit
300
As the temperature of a wair increases so does the ______
Electrical resistance
300
Which circuit is used in every house?
Parallel circuit
300
Describe how a circuit breaker works.
When a current becomes too large and begins to get hot, a piece of metal in the circuit breaker bends, which causes a switch to flip and open the circuit.
400
How many times stronger is electrical forces compared to gravitational forces?
10 to the 39th power
400
What does a dry-cell battery consist of?
A dry-cell consists of two electrodes surrounded by a material called electrolyte.
400
In a circuit, what things are all related?
Voltage difference, current and resistance
400
Describe how energy travels through two light bulbs that are set up in a parallel circuit.
Because there are two or more branches, the current can flow through both or either of the branches, and because all the branches connect the same two points in the circuit,the voltage difference is the same in each branch. then, according to Ohm's law, more current will flow through branches that have lower resistance.
400
What is electrical power? How do you know what the power rating for an appliance is?
Rate at which elctrical power is converted to another form of energy. On every appliance, there is an area that tells you what the power rating is.
500
What forces cause surfaces to stick together?
Friction and Electrical
500
Which type of battery is most often found in cars? What is the battery made of?
Lead-acid. Contains a series of six wet cells made up of lead and lead dioxide plates in a sulfuric acid solution.
500
Ohm's Law equation
Current(in amperes) equals the voltage difference(in volts) over resistance(in ohms)OR I=V/R
500
Name an advantage of using parallel circuits.
When you turn one light off, the current continues to flow through other branches.
500
Electrical power equation
Electrical power(in watts) equals current(in amperes) times the voltage difference(in volts) OR P=IV