Forms of Energy
Energy that is caused by the movement of charged particles in an electrical field
Electrical Energy
When I plug in a toaster, what is the electrical energy transforming into when it toasts my bread?
Thermal Energy
Which one of the following means how many electrons are flowing through a wire or device?
Current
What is resistance measured in?
ohms
An 2 kg apple is hanging in a tree, 10 ft off the ground. What is the gravitational potential energy (gravity = 9.8 m/s2) of the apple?
196 J
The energy caused by moving particles. We feel it as heat.
Thermal Energy
The food we eat starts as mechanical energy and turns into ________.
chemical energy
How much energy or pushing force available to move electrons through a circuit is known as __________ and is measured using __________.
Voltage, volts
What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?
10 V
Which would have the LEAST gravitational potential energy (GPE)?
A ball sitting on the ground
Moon viewed from the Earth
An airplane flying 30,000 feet above the ground
A rock sitting on top of Mt. Everest
A ball sitting on the ground
Legs pedaling a bicycle is an example of _________ energy.
Mechanical Energy
In a flashlight, the batteries contain ______ energy, which turns into _______ energy.
The tendency for a material to oppose the flow of electrons, changing electrical energy into thermal energy and light.
Resistance
An alarm clock draws 0.5 A of current when connected to a 120 volt circuit. Calculate its resistance.
240 ohms
A golf pro swings his driver with a mass of 0.75 kg at a velocity of 60 m/s. What is the kinetic energy of the club?
1350 J
What is the difference between potential energy and kinetic energy?
Potential energy is the energy of an object due to its position, while kinetic energy is energy due to its motion.
Which energy transformation takes place when using a corded power drill?
electrical to mechanical
As the resistance of a circuit increases, the current will
decrease
Define Ohm’s Law
a law stating Voltage is equal to the current multiplied by the resistance.
A baby carriage sitting at the top of a hill is at a height of 21 m high. The carriage with the baby weighs 12 N. What kind of energy does the carriage have and how much?
potential energy and 252 J
What factors determine an object's kinetic energy?
Mass and velocity
What energy transformation occurs when a fan is plugged into a wall and turned on?
Electrical to Mechanical (energy of motion)
This circuit has more than one loop. When one light goes out, the others stay on.
Parallel circuit
A Charging system producing 14.5 Volts with a current flow of 43.5 Amps, what is the circuit resistance
0.33 amps
An explosion of gas from a Hawaiian volcano blows a rock into the sky. The rock has 2000J of kinetic energy. What was its mass if the rock had a velocity of 20m/s?
10 kg