Electricity

1. The unit of electric power called the watt is defined as
A. 1 joule per second                 B. 1 erg per second                 
C. 1 joule per coulomb v           D. 1 newton-m. per coulomb.

2. Which of the following is correct?
A. watts = volts X ohms
B. watts = volts X amperes
C. watts = ohms X seconds
D. watts = amperes X seconds

3. What is the maximum electric power that can be used when a 20-ampere fuse is in series in a circuit on a 110-volt line?
A. 2200 watts                     B. 5.5 watts             C. 90 watts                D. 130 watts
 
4. A unit of electric power one thousand times as great as the watt is the
A. megawatt                 C. mil1iwatt
B. kilowatt                     D. microwatt

5. What power is being used by an electrical appliance that operates on a 110-volt line and draws a current of 5 amperes?
A. 22 watts             B.  550 watts             C. 105 watts             D. 2750 watts

6. What voltage must be applied to a 1100-watt heating-element to drive a current of 5 amperes through it?
A. 5500 volts             B 110 volts               C. 55 volts             D. 220 volts

7. What current flows through a 1100-watt toaster when it is connected to a 110-volt line?
A. 121,000 amperes                                 C. 5 amperes
B. 10 amperes                                            D. 0.1 ampere

8. What is the horsepower (approximately) of a motor that draws a current of 4 amperes when connected to a 110-volt line?
A. 0.4 h.p.                                         C. 5 h.p.
B. 0.6 h.p                                        . D. 44 h.p.

9. What is the cost of operating a refrigerator for six hours if it draws a current of 2.1 amperes on the 110-volt line and if the cost of a kilowatt-hour of electrical energy is 3.0 cents?
A. 12 cents                           C. 4.2 cents                 B. 14 cents                     D. $1.38