A circuit in a home provides power to a light fixture. The homeowners want to use a compact fluorescent bulb instead of an incandescent bulb. Compact fluorescent bulbs can produce as much light as incandescent bulbs but with less energy. How is this possible?(1 point)
Responses
Fluorescent bulbs have been designed to put out more energy than they receive.
Fluorescent bulbs have been designed to put out more energy than they receive.
Energy is destroyed when it passes through an incandescent bulb.
Energy is destroyed when it passes through an incandescent bulb.
Fluorescent bulbs produce other forms of energy, too, including heat.
Fluorescent bulbs produce other forms of energy, too, including heat.
Incandescent bulbs produce other forms of energy, too, including heat.
Fluorescent bulbs are more energy efficient because they produce light by exciting mercury vapor with electricity, which generates ultraviolet light that then causes the phosphor coating inside the bulb to glow, producing visible light. This process uses less energy compared to heating a filament in an incandescent bulb to produce light.
The batteries of some flashlights can be charged by turning a handle. Which energy transformation is happening in this process?(1 point)
Responses
kinetic to potential to light
kinetic to potential to light
kinetic to electrical to light
kinetic to electrical to light
kinetic to electrical to chemical
kinetic to electrical to chemical
kinetic to potential to chemical
kinetic to potential to chemical
kinetic to electrical to light
How does the power switch on a computer work?(1 point)
Responses
Turning the switch on causes the conductors to release electrons.
Turning the switch on causes the conductors to release electrons.
Turning the switch on activates the power source to allow electrons to flow.
Turning the switch on activates the power source to allow electrons to flow.
Turning the switch on completes the circuit between the power source and the load.
Turning the switch on completes the circuit between the power source and the load.
Turning the switch on turns on the parts that convert electrical energy to other forms.
Turning the switch on completes the circuit between the power source and the load.
What is chemical energy?(1 point)
Responses
energy stored in the bonds between the parts of an atomic nucleus
energy stored in the bonds between the parts of an atomic nucleus
energy stored in the bonds between atoms and molecules
energy stored in the bonds between atoms and molecules
energy carried by electrical current
energy carried by electrical current
energy due to the jiggling motion of molecules
energy stored in the bonds between atoms and molecules
Which energy transformation occurs when you rub your hands together to warm them?(1 point)
Responses
kinetic energy to radiant energy
kinetic energy to radiant energy
thermal energy to kinetic energy
thermal energy to kinetic energy
thermal energy to potential energy
thermal energy to potential energy
kinetic energy to thermal energy
kinetic energy to thermal energy