You connect an ideal battery to a variable resistor (its resistance can by chang

Question

You connect an ideal battery to a variable resistor (its resistance can by changed by, say, a knob). As you vary the resistance, what if anything in the circuit doesn't change?

A) the current through the battery
B) the voltage across the resistor
C) the current through the resistor

Current goes to the right through a resistor R. What can you say about the potential V and electric field E?

A) There is an E field to the left, V is larger on the right side of R.
B) There is no E field in the resistor, V is the same on both sides of R.
C) There is an E field to the right, V is larger on the right side of R.
D) There is an E field to the left, V is larger on the left side of R.
E) There is an E field to the right, V is the same on both sides of R.
F) There is an E field to the right, V is larger on the left side of R.
G) There is no E field in the resistor, V is larger on the left side of R.
H) There is no E field in the resistor, V is larger on the right side of R.

We can characterize a circuit element by its I-V curve (a graph of current through it vs voltage difference across it). For an Ohmic resistor, the resistance is the:

A) slope of this graph
B) peak value of this graph
C) 1/slope of this graph
D) x-intercept of this graph
E) y-intercept of this graph

Explanation / Answer

You connect an ideal battery to a variable resistor (its resistance can by changed by, say, a knob). As you vary the resistance, what if anything in the circuit doesn't change?

B) the voltage across the resistor

Current goes to the right through a resistor R. What can you say about the potential V and electric field E?

F) There is an E field to the right, V is larger on the left side of R.

We can characterize a circuit element by its I-V curve (a graph of current through it vs voltage difference across it). For an Ohmic resistor, the resistance is the:

C) 1/slope of this graph

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