27. Resistors & DC Circuits

Intro to Current

Multiple Choice
In an introductory circuits context, which device restricts electric current flow to a single direction?
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Multiple Choice
If the voltage across a circuit remains constant ( $V =constant$ ), how does the current ( $I$ ) change when the resistance ( $R$ ) is doubled?
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Multiple Choice
Topic: Intro to Current. Two cylindrical copper wires have the same length but different diameters. Wire A has diameter $d_{A}$ and Wire B has diameter $d_{B}$ , with $d_{B} > d_{A}$ . If the same potential difference $V$ is applied across each wire, which wire can carry the higher current?
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Multiple Choice
In introductory electricity, what SI unit is used to measure the strength of an electric current?
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Multiple Choice
Which of the following best defines electric current?
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Multiple Choice
Which of the following is the correct SI unit for electric current?
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Multiple Choice
In introductory electricity, electric current is measured in which SI unit?
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Multiple Choice
In an introductory discussion of electric current, two common sources of electric current are generators and which of the following?
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Multiple Choice
Which type of electric current is typically supplied to household wiring in most homes?
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Multiple Choice
A current of $1.8 A$ delivers a charge of $2.5 C$ . How much time was required?
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Multiple Choice
In an electric circuit, how is current measured using an in-line (series) ammeter?
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Multiple Choice
A circuit consists of a $12 V$ battery connected in series with a $6 Ω$ resistor. What is the current flowing through the resistor?
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Multiple Choice
In an electric circuit, how is current measured using an in-line (series) ammeter?
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Multiple Choice
In the circuit shown, two batteries with emfs $e_{1}$ and $e_{2}$ are connected in series with resistors $R_{1}$ and $R_{2}$ . If the current flowing through $e_{2}$ is $i_{2}$ , what is its value?
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Multiple Choice
Which of the following best describes the relationship between electric current $I$ , charge $Q$ , and time $t$ in a conductor?
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