54. Which cell organelle is also called powerhouse of the cell?

What is the powerhouse of the cell?

Fill in the blank:

In a                   ___ environment, both animal and plant cells ___                             ___ as the water

moves                     the cell through the process of                       , Animal cells would die. In plant

cells this process is called plasmolysis, or the plant cells are                            ___ (shrink) - this is when

the plasma membrane pulls away from the cell wall, as excess water goes out of the cell. The cell wall protects

the plan cell from dying right away and they can go back to normal when the concentration of solutes is lowered on 

the                         ___ of the cell. When this happens, the water will move from a ___    solution 

towards a ___                             solution through the process of ___                ___.

Grade 9 Science electricity multiple choice:

1. All of the following are examples of a load in an electric circuit, except…
2. heaters b. motors c. lamps d. batteries

1. A continuous path in which electrons can flow is called a(n)…
2. electric circuit b. photovoltaic cell c. electric cell d. electrolyte

1. The part of an electric circuit that converts electrical energy into other forms of energy is called a(n)…
2. connecting wire b. energy source c. load d. switch

1. What type of energy does a fan convert into motion?light energy b. thermal energy c. electrical energy d. none of the above

1. An electric cell that may only be used once is called a… a. primary cell secondary cell c. fuel cell d. photovoltaic cell

1. Electrons will only flow in an electrical circuit if …
2. the circuit breaker is open. c. their path is complete and continuous
3. there is a gap between the conductors d. the switch is not closed.

1. The rate at which electric charges (electrons) move past a given point in a circuit is called…
2. voltage b. resistance c. current d. none of the above

1. The symbol for electric current is…
2. I b. V c. A d. C

1. A device used to measure potential difference is called a(n)…
2. electroscope b. ohmmeter c. ammeter d. voltmeter

1. Electrical resistance is measured in…

      a. amperes b. watts c. ohms d. volts

1. Electrical Resistance is the ability (or force) that …
2. stops or slows down the electric charges in a circuit        
3. that can either help or stop the electric charges in a circuit
4. helps or speeds up the electric charges in a circuit        
5. none of these are correct

1. Loads connected in series…
2. do not affect the total resistance of the circuit       c. increase the total resistance of the circuit
3. decrease the total resistance of the circuit       d. It depends on the wattage of the loads

1. What will happen to other lamps on a parallel circuit if an additional light bulb is added?
2. They will continue to glow the same brightness               c. Some will get brighter and some will go out
3. They will all continue to glow and will get brighter            d. They will all go out

1. A series circuit has three identical lamps. The potential difference of the energy source is 30V. The resistance of each lamp is 5 Ω. What is the current through each lamp? (Hint: draw a picture of the circuit)

1. 0.167 A b. 2 A c. 6 A d. 150 A

1. One watt of electrical power is equal to…
2. one joule per second       b. one joule per minute   c. ten joules per second d. ten joules per minute

1. Electrical energy in your home is measured in…
2. Joules       b. Amps       c. Kilowatt-Hours     d. Watts

1. If you wish to lower your energy costs, which of the following times would be best to use an electric clothes dryer?
2. Monday at 1:00 p.m.   b. Tuesday at 9:00 a.m. c. Friday at 3:00 p.m.             d. Saturday at 8:00 p.m.

1. An older electrical safety device that contains a small wire that melts and breaks apart when current is too high is a…
2. Circuit Breaker       b. Fuse       c. Ground Fault Interrupter       d. 3-hole outlet

1. This electrical safety device, which is typically found in bathrooms, sc

1. Circuit Breaker       b. Fuse       c. Ground Fault Interrupter     d. 3-hole outlet

1. Which of the following devices measures the amount of energy used every hour in a house or apartment building?
2. Phantom load       b. Fuse               c. Smart Meter         d. Ground Fault Interrupter