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The unit used to measure current is:
a. joule (J)
b. watt (W)
d. volt (V)
c. ampere (A)
In science class, your teacher rubs a glass rod with a piece of rabbit fur. He/she then moves the glass rod toward a piece of vinyl on a desk, causing the vinyl to move toward the glass rod. The reason this happens is:
a. the glass rod and the piece of vinyl have opposite charges
b. the glass rod and the piece of vinyl have like charges
c. the glass rod and the piece of vinyl both have neutral charges
d. there is no way to know
a. the glass rod and the piece of vinyl have opposite charges
Power, the rate at which work is done, is measured in:
a. ampere (A)
b. joule (J)
c. watt (W)
d. volt (V)
c. watt (W)
The basic components of an electrochemical (wet) cell include two electrodes made of:
a. the same material, and an electrolyte made of a solid substance
b. the same material, and an electrolyte made of a liquid solution
c. different materials, and an electrolyte made of a solid substance
d. different materials, and an electrolyte made of a liquid solution
d. different materials, and an electrolyte made of a liquid solution
Some lights are controlled by dials rather than by switches. The dial controls brightness by changing the resistance of the electrical circuit. This type of device is called a:
a. fuse
b. switch
c. breaker
d. rheostat
d. rheostat
A definition of current electricity is:
a. the steady flow of charged particles
b. the build up of electric charges on an object
c. the loss of electric charges through a conductor
d. the flow of electrons in all directions through an insulator
a. the steady flow of charged particles
Energy is stored in a cell or battery in the form of:
a. chemical energy
b. mechanical energy
c. thermal energy
d. electrical energy
a. chemical energy
You attach a small light bulb to the negative terminal of a battery but the light does not work. You then attach a second wire from the light bulb to the positive terminal of the same battery. Why is this second wire necessary?
a. The electrons from the battery must be allowed to flow through the light bulb along two different paths
b. The electrons must continually flow from both the positive and negative terminal to light the bulb
c. The electrons must be allowed to flow from the positive terminal of the battery to the light bulb
d. The electrons need a complete circuit from the negative terminal to the positive terminal
d. The electrons need a complete circuit from the negative terminal to the positive terminal
You have learned that resistance in a wire changes with both the length and diameter of the wire. Which wire would offer the most resistance to an electrical current?
a. copper wire that is 50 cm long and has a diameter of 3 mm
b. copper wire that is 25 cm long and has a diameter of 3 mm
c. copper wire that is 50 cm long and has a diameter of 1.5 mm
d. copper wire that is 25 cm long and has a diameter of 1.5 mm
c. copper wire that is 50 cm long and has a diameter of 1.5 mm
What is the voltage of an MP3 player circuit if 0.50 A of current encounters 6 Ω of resistance?
a. 3000 V
b. 12 V
c. 42 V
d. 3.0 V
d. 3.0 V
Which of the following examples relates best to the behaviour of current electricity?
a. Water contained in a hot water tank
b. Water being held back by a dam
c. Water flowing down a river
d. Water freezing on a lake
c. Water flowing down a river
One morning you are late for school and you decide to skip breakfast. Later that morning you feel
weak, but after eating a granola bar and drinking some juice you feel much better. What form of energy are the granola bar and juice?
a. chemical energy
b. dietary energy
c. human energy
d. thermal energy
a. chemical energy
A fuse burns out in your home and when you go to replace it you find that it is a 10-A fuse. You look around the house and all you can find is a 15-A fuse. Why should you not use the 15-A fuse in the circuit designed for a 10-A fuse?
a. The 15-A fuse will not allow enough current through the circuit and may damage an electrical device being plugged into an outlet
b. The 15-A fuse will not fit into the 10-A fuse circuit and you will damage the fuse box when you try to put in the fuse
c. The 15-A fuse will burn out almost immediately because it is unable to carry as much current as the 10-A fuse
d. The 15-A fuse will allow too much current through the circuit and may damage an electrical device being plugged into an outlet
d. The 15-A fuse will allow too much current through the circuit and may damage an electrical device being plugged into an outlet
What is the type of energy input of a power plant that uses the warmth below the Earth’s crust?
a. chemical energy
b. mechanical energy
c. thermal energy
d. electrical energy
c. thermal energy
What is the type of energy output if a crane lifts large metal objects to the top of a building?
a. chemical energy
b. mechanical energy
c. thermal energy
d. electrical energy
b. mechanical energy
While at the mall, Bella sees a person in a wheelchair. A battery powers the wheelchair and the person simply manipulates a lever to move the wheelchair. What energy conversion(s) occur in the wheelchair to make it move?
a. electrical → mechanical
b. chemical → mechanical
c. electrical → chemical → mechanical
d. chemical → electrical → mechanical
d. chemical → electrical → mechanical
Label the following as renewable/non-renewable
coal
water
natural gas
solar
coal non-renewable
water renewable
natural gas non-renewable
solar renewable
A heater is 70%
Being 70% efficient means that the heater
a. converts 70% of the input energy into usable thermal energy.
b. converts 70% of the input energy into usable mechanical energy.
c. converts 30% of the input energy into usable thermal energy.
d. converts 30% of the input energy into usable mechanical energy.
a. converts 70% of the input energy into usable thermal energy.
Fossil fuels such as oil, natural gas, and coal can be burned in order to produce electrical energy. In this process the heat generated with the burning of the fuel is used to heat water to produce steam with a high temperature and pressure. The steam then turns large turbines, which generate electricity. What are the energy conversions that take place in this process?
a. chemical → thermal → electrical
b. chemical → mechanical → electrical
c. chemical → mechanical → thermal → electrical
d. chemical → thermal → mechanical → electrical
d. chemical → thermal → mechanical → electrical
Franklin spent 1.5 minutes checking his grade on PowerSchool. If his phone has a power rating of 10.00 W, what was the total energy consumed (in Joules)?
P=E/t
Hint * remember t is in seconds
900 J
Carbon dioxide is a gas that is produced by the burning of coal in power-generating plants. It is also a product of cellular respiration in living organisms. What environmental problem is being created by the industrial production of carbon dioxide in large amounts?
a. acid rain
b. ozone depletion
c. global warming
d. photochemical smog
c. global warming
In science class, your teacher produces static electricity using a Van de Graaff generator. How does the Van de Graaff generator produce this static electricity?
a. It uses current electricity to remove static charges
b. It uses friction to produce the static charge
c. It uses magnets to attract electric charges
d. It uses electricity to add electric charges
b. It uses friction to produce the static charge
Which of the following is a non-renewable energy source?
a. solar
b. coal
c. wind
d. geothermal
b. coal
How much heat does an 80.00% energy efficient oven produce, if 1000 J of electrical energy is used to power the oven?
a. 1250 J
b. 800.0 J
c. 12.50 J
d. 0.08 J
Efficiency=output/input x 100
b. 800.0 J