Question
Which two changes to a metal wire both decrease its resistance?
length of wire | cross-sectional area of wire | |
A | decrease | decrease |
B | decrease | increase |
C | increase | decrease |
D | increase | increase |
Answer/Explanation
Ans: B
Question
Which two changes to a metal wire both decrease its resistance?
length of wire | cross-sectional area of wire | |
A | decrease | decrease |
B | decrease | increase |
C | increase | decrease |
D | increase | increase |
Answer/Explanation
Ans: B
Question
Identical resistors are connected together to form arrangements $X, Y$ and $Z$.
What is the correct order of the resistances of the arrangements from the largest to the smallest?
A $\quad \mathrm{X} \rightarrow \mathrm{Y} \rightarrow \mathrm{Z} $
B $\quad \mathrm{Y} \rightarrow \mathrm{X} \rightarrow \mathrm{Z} $
C $\quad \mathrm{Z} \rightarrow \mathrm{X} \rightarrow \mathrm{Y}$
D $\quad \mathrm{Z} \rightarrow \mathrm{Y} \rightarrow \mathrm{X}$
Answer/Explanation
Ans:D
Question
A student is to determine the resistance of resistor R. She uses a circuit including a voltmeter and an ammeter.
Which circuit should be used?
Answer/Explanation
Ans: D
Question
A student makes four resistors using different pieces of wire. The wires have different diameters
and lengths. All the pieces of wire are made of the same material.
Which piece of wire will make the resistor with the largest resistance?
|
diameter / mm |
length / cm |
|
|
A |
0.8 |
10 |
|
B |
0.8 |
17 |
|
C |
2.0 |
10 |
|
D |
2.0 |
17 |