HS Energy/Electricity/Magnetism Review

A 24-V battery is powering a light bulb with a resistance of 2.5 ohms. What is the current flowing through the bulb

9.6 A

the method of heat transfer by which the sun warms the earth is

radiation

If the battery on a circuit is a 9-volt battery and there are 3 lights, how much voltage does each light receive

3 Volts

When voltage increases and resistance remains constant what must happen to current

Current must decrease

magnetism is a... power, force, form of energy, or. form of electricity

Force

Waters______ explains why this substance helps to regulate body temperature as well as the Earths climate

High specific heat

What unit measures heat

Joules

A series circuit contains four light bulbs. The switch is opened and one of the bulbs is removed, but not replaced,. Then the switch is close again. What would you expect to see?

None of the remaining light bulbs will be on

Chef Tom works in a very busy restaurant. Hs cooks 100s of people each night. Why Chef Tom would use a copper pot instead of aluminum pot?

The copper pot heats up faster because it is a better conductor

What is the problem encountered with nuclear waste disposal

The isotopes have long half-life and remain radioactive for a long time period

At a constant pressure, melting occurs by

absorbing energy

As temperature rises from 25 to 60 degrees celsius the material __________ heat and it's kinetic energy ________ as the material goes through vaporization to become a gas

absorbs, increases

Give evidence that heat transfer through radiation has occurred and why

at several deer from a fire, you still feel the heat. Heat is transferred through the air

which example shows electrical energy being transformed into heat energy? a-burning a wax candle b- a small toaster oven toasts bagel c- rubbing two sticks together d- sunlight heating a metal door

b- a small toaster over toasts bagel

A container of cold water is dumped into a container of hot water. It is mixed and then left alone for a long time interval. The water temperature is found to

be the same in all areas of the container

Aluminum has a specific heat of 0.902 J/g x degrees celsius. Two pieces of aluminum, with masses of 10kg, cool from 400 degrees celsius to 100 degrees Celsius. One mass is round. the other is a cube. All but one statement is true regarding the energy transformation. That is a- both masses lose the same amount of heat energy b- the masses cool in approximately the same amount of time c- the heat energy lost is directly related to the shape of the object d- the kinetic energies of the masses decrease during the cooling process

c- the heat energy lost is directly related to the shape of the object

When a ballon is rubbed with human hair, the balloon acquired an excess static charge. This implies that some materials

can give up electrons more readily than others

What is the energy transformation taking place, from the batteries to the flashlight when it is on

chemical to electrical to light

The process by which hot and cold air are transferred in the atmosphere is

convection

What is a negative aspect of nuclear power a-Nuclear power is a renewable energy source b-Nuclear power does not contribute to the greenhouse effect c-It is more efficient than other methods of energy production d- Exposure to radiation can lead to disease or genetic abnormalities

d- Exposure to radiation can lead to disease or genetic abnormalities

when an object gains or looses electrons, it becomes

electrically charged

A reaction that absorbs heat from the surroundings is known as a(n)

endothermic reaction

The law of conservation of energy states that

energy may neither be created nor destroyed; it may only be transformed

Maria's gaithersburg started a fire in the fireplace. He crumbled some paper, lit a match, and soon the logs in the fireplace were burning. In this case, the stored chemical energy in the logs was changed into

heat and light energy

An electromagnet is created using a battery, N insulated copper wire and iron nail. The wire is wrapped around the nail 20 times and attached to the battery. Which pair of changes will definitely increase the strength of the electromagnet

increase the voltage of the battery and increase the number of turns on the coil

What process is the method by which a neutral object obtains an electrical charge

induction

what type of heat transfer is used to fry an egg in a pan and how can you tell?

it is conduction beaches the egg is touching the pan

If we cool a volume of ammonia, it will freeze at -107.9 F. that same volume of ammonia boils at -28 F and it's gaseous phase condenses to form a liquid at -28 F. The temperature, -107.9 F, is also ammonia's

melting point

Nuclear fission reactors work off a chain reaction that produces energy. This type of energy production is often viewed as a viable option to burning fossil fuels. What is an advantage to using nuclear power over fossil fuels

nuclear power does not produce smoke or carbon dioxide

Power plants can be powered by fossil fuels, such as coal or natural gas, if nuclear power to produce steam to turn turbines to generate electricity. why might one not choose nuclear power over the fossil fuels

radioactive waste requires special treatment and disposal procedures

The process by which people walk

relies on the conversion of chemical energy from food into mechanical energy by muscles.

When we fought a Van de Graaff generator, our hair may stand up if it is dry. This happens only if the strand of our hair...

repel each other

Leaf electroscope is a device that indicates the existence of electric charges on an object. The leaves spread apart when is object is brought near of touches the electroscope. What observation would suggest that the object touched the electroscope

the leaves remained apart after the charged object was removed

A nuclear power plant, a hydroelectric dam, a coal burning power plant have what in common

they are all sources of electricity

is this true or false? Stores energy in a battery can be transformed into electrical energy.

true