1. A resistor carries a current I. The power dissipated in the resistor is P. What...
1. A resistor carries a current I. The power dissipated in the resistor is P. What is the power dissipated if the same resistor carries current 3I?
A. P
B. 3P
C. 9P
D. P/9
2. Which of the following statements is false?
| A. An electric field is needed to produce an electric current. | |
| B. A potential difference between two points is needed to produce an electric current. | |
| C. For a steady current to flow in a wire, the wire must be part of a closed circuit. | |
| D. The electric field is constant along all parts of the circuit when a steady current is flowing. | |
| E. The electric current in a wire is proportional to the drift velocity of the charges. |
Homework Answers
1. 9P
2.
| B. A potential difference
between two points is needed to produce an electric
current. |
apply power = P = i^2R
so if i is tripled,
P also triples so answer is option 3^2 iR = 9P
option C it is
-----------------------------------
C. For a steady current to flow in a wire, the wire must be part of
a closed circuit.
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