Studied by 10 people
Who created the first battery and in what year
Alessandro Volta 1790-1800
What was the first battery made up of
Alternating disk of zinc and silver separated by paper soaked with a solution of brine (salt water)
How did the inventor of the first battery increase the voltage
Add ore alternating stacks of zinc, silver and paper soaked in brine
What are the two types of batteries
Dry and wet
How do batteries get a negative charge
By the zinc corroding fast
How does a dry cell get a positive charge
Carbon electrode/pencil lead corroding slowly
How does a wet cell get a positive charge
Copper corroding slowly
Where is a dry cell used
Household items
Where is a wet cell used
Vehicals
How to batteries run out of electricity
Zinc corrodes completely
What is the advantage of using dry cells
Come in different sizes
What is the advantage to using wet cells
Powerful and rechargeable
What voltage to most batteries have
1.5V
What’s the difference between different household batteries
Bigger batteries have more zinc to corrode.
What is the red knob on a 12V battery
Positive terminal
What is the blue/black knob on a 12V battery
Negative terminal
What are the yellow knobs on a 12V battery
6 2V wet cell batteries
What is a conductor
Something that can transfer electrons
What is an insulator
Something that stops electrons
What is a resistor
Something that transforms electrons into a different kind of energy
What determines how much resistance a resistor will have
Material, Temperature (hotter = more resistance), Diameter (thinner = more resistance), Length (longer = more resistance)
What is potential energy in a circuit
Voltage/stored energy/the buildup of electrons
What is kinetic energy in a circuit
Amps/flow of electrons
How do resistors affect the flow of electrons
Transforms electrons into a different type of energy, decreases the electrical energy in current
Electricity always takes the path ______
of least resistance
What does a voltmeter do
Measure voltage in a circuit
Is a voltmeter part of a circuit
No because it doesn’t use electrons
What does an ammeter do
Measure amps in a circuit
Is an ammeter part of a circuit
Yes because it uses electrons
What are the two types of circuits
Series and parallel
Why do all light bulbs go out in a series circuit if only one goes out
Because there is only one path for electrons to flow
Why don’t all light bulbs go out in a parallel circuit if only one goes out
Because there are multiple paths for electrons to flow
How does a blinker bulb work
The bimetallic strip heats and brass expands and bends towards steel side and disconnects circuit, brass then cools and contracts and bends back to brass side and reconnects circuit
What are the six main forms of energy
Thermal, chemical, mechanical, electrical, electromagnetic, nuclear
What are the two types of currents
Alternating current and direct current (ACDC)
How does a direct current flow
Only one direction (- → +)
How does a alternating current flow
Switches ways it travels (60 times/sec)
Where is A/C electricity used
Outlets/plugs, transmission lines
Where is D/C electricity used
Batteries, solar panels, charger - part that goes into computer
What is a minor resistor
Resistor that can only transform electricity into one type of energy
What is a major resistor
Resistor that can transform electricity into two or more types of energy
What does the inside of a light bulb look like
Tungsten filament, wires going to side and bottom, plastic at the bottom
Resistance formula
R= V/I
Voltage formula
V = IR
Current/amps formula
I = VR
Power formula
W = VI
Note
Flashcard