Resistors LEDs Ohms Voltage Current Parallel Series Electricity

Which circuit diagram represents the correct way to measure the current in a resistor?

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When only one lightbulb blows out, an entire string of decorative lights goes out. The lights in this string must be connected in

• series with multiple current pathways

• series with one current pathway

• parallel with multiple current pathways

• parallel with one current pathway

A 3-ohm resistor and a 6-ohm resistor are connected in parallel across a 9-volt battery. Which statement best compares the potential difference across each resistor?

• The potential difference across the 6-ohm resistor is four times as great as the potential difference across the 3-ohm resistor.

• The potential difference across the 6-ohm resistor is half as great as the potential difference across the 3-ohm resistor.

• The potential difference across the 6-ohm resistor is the same as the potential difference across the 3-ohm resistor.

• The potential difference across the 6-ohm resistor is twice as great as the potential difference across the 3-ohm resistor.

Circuit A has four 3.0-ohm resistors connected in series with a 24-volt battery, and circuit B has two 3.0-ohm resistors connected in series with a 24-volt battery. Compared to the total potential drop across circuit A,

the total potential drop across circuit B is

• four times as great

• twice as great

• the same

• one-half as great

A 3.0-ohm resistor and a 6.0-ohm resistor are connected in series in an operating electric circuit. If the current through the 3.0-ohm resistor is 4.0 amperes, what is the potential difference across the 6.0-ohm resistor?

• 12 V

• 24 V

• 2.0 V

• 8.0 V

A 2.0-ohm resistor and a 4.0-ohm resistor are connected in series with a 12-volt battery. If the current through the 2.0-ohm resistor is 2.0 amperes, the current through the 4.0-ohm resistor is

• 1.0 A

• 4.0 A

• 2.0 A

• 3.0 A

A 6.0-ohm lamp requires 0.25 ampere of current to operate. In which circuit below would the lamp operate correctly when switch S is closed?

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The diagram above represents a circuit consisting of two resistors connected to a source of potential difference.

What is the current through the 20.-ohm resistor?

• 12 A

• 6.0 A

• 4.0 A

• 0.25 A

The circuit diagram above represents four resistors connected to a 12-volt source. What is the total current in the circuit?

• 2.0 A

• 0.50 A

• 24 A

• 8.6 A

In the electric circuit diagram above, possible locations of an ammeter and a voltmeter are indicated by circles 1, 2, 3, and 4.

Where should an ammeter be located to correctly measure the total current, and where should a voltmeter be located to correctly measure the total voltage?

• ammeter at 1 and voltmeter at 2

• ammeter at 3 and voltmeter at 4

• ammeter at 2 and voltmeter at 3

• ammeter at 1 and voltmeter at 4