Circuits
This is the name for a path through which electrons can flow.
A circuit
State the Law of Conservation of Energy
Energy cannot be created or destroyed.
A toaster pulls a current of 2A, and has a resistance of 60 ohms. What is the voltage drop across the toaster?
120V
What do we call electricity that isn't moving?
Static
What is the kinetic energy of a 2kg rabbit hopping at a speed of 1.25 m/s?
1.56J
Why do wires work well in a circuit?
The metal on the inside is a good conductor of electricity
A person eats an apple and then throws a ball. What was the energy transformation that took place?
Chemical to Mechanical
A pencil sharpener draws a current of 3A and is connected to a wall outlet that provides 120V. What is the resistance of the pencil sharpener?
40 ohms
Why would positive charges be drawn to one side of an object?
The mass of a golf club is 0.6 kilograms. Suppose the club is traveling 2.0 meters per second. What is the club’s Kinetic energy?
1.2J
This component breaks the circuit if a certain amount of current passes through it.
What is a fuse?
An apple tree uses the sun to create its own food by way of photosynthesis. What energy transformation occured?
Solar to Chemical
A toaster has a resistance of 60 Ω and is plugged into a 120 V power supply, what is the current in the toaster?
2 amps
Does friction charge an object by depositing many electrons or a few?
Only a few.
Calculate the kinetic energy of a car with a mass of 475kg rolling down a hill at a speed of 5m/s.
5937.5J
Three lightbulbs are connected in a series circuit. If one bulb goes out, what will happen to the brightness of the other bulbs?
They all go out. (It decreases)
A boulder that was sitting on the edge of a cliff falls. What energy transformation took place?
Potential to Kinetic
What is the unit for current?
Amps
Charging an object by way of conduction results in the electrons being evenly distributed or tightly compacted?
What is the potential energy of an apple that is 3.00 meters high with a mass of 2kg?
58.8J
You have a series and a parallel circuit, you disconnect a bulb from each circuit. Which circuit will still have current flowing to their other lights?
Parallel
In ALL energy transformations does the total energy increase, decrease, or stay the same
Stays the same
What is the unit for resistance?
Ohms ( Ω )
What electrical machine converts mechanical energy into electrical energy?
An electric generator
What is the kinetic energy of a 2,000-kilogram boat moving at 5 m/sec?
25,000J