Physics 236 Worksheet: Chapter 27, Current and Resistance

1.     Coulombs per second is the unit of:

a.     potential difference

b.      current

c.      resistance

d.     power

2.     Joules per second is the unit of:

a.     potential difference

b.      current

c.      resistance

d.     power

3.     Joules per coulomb is the unit of:

a.     potential difference

b.      current

c.      resistance

d.     power

4.     Volts per amp is the unit of:

a.     potential difference

b.      current

c.      resistance

d.     power

5.     The same current flows in a 100 W and a 200 W resistor for the same amount of time.

a.     The same heat is produced in both resistors.

b.      Twice as much heat is produced in the 100 W resistor.

c.      Four times as much heat is produced in the 100 W resistor.

d.     Twice as much heat is produced in the 200 W resistor.

e.     Four times as much heat is produced in the 200 W resistor.

6.     10 v is applied to a 20 W resistor for 30 s. The total charge that flows is:

a.     2.0 C

b.      5.0 C

c.      15 C

d.     60 C

7.     10 v is applied to a 20 W resistor for 30 s. The total heat produced is:

a.     5.0 J

b.      15 J

c.      60 J

d.     150 J

8.     Wire A has a resistance of 100 W. Wire B is made of the same material as A but is twice as long and has 1/2 the diameter. The resistance of B is:

a.     25 W

b.      50 W

c.      100 W

d.     200 W

e.     400 W

f.       800 W

 

Ans: 1-b, 2-d, 3-a, 4-c, 5-d, 6-c, 7-d, 8-f