Formative Assessment 8.3

Given the simple electrical circuit shown, if the current in all three resistors is equal, which of the following statements must be true?

• X, Y, and Z all have equal resistance

• X and Y have equal resistance

• X and Y added together have the same resistance as Z

• X and Y each have more resistance than Z

When two resistors are connected in series, the equivalent resistance of the combination is 5-ohms. Which of the following statements about the resistances is correct?

• Both resistors are greater than 5-ohms

• Both resistors are equal to 5-ohms

• Both resistors are less than 5-ohms

• One of the resistances is greater than 5-ohms, and one of the resistances is less than 5-ohms

The three lightbulbs in the circuit shown are identical, and the battery has zero internal resistance. When switch S is closed to cause Bulb 1 to light, which of the other two bulbs increase(s) in brightness?

• Neither bulb

• Bulb 2 only

• Bulb 3 only

• Both Bulb 2 and Bulb 3

The total equivalent resistance between points X and Y in the circuit shown is

• 3 ohms

• 4 ohms

• 5 ohms

• 6 ohms

Kirchhoff's loop rule for circuit analysis is an expression of which of the following?

• Conservation of charge

• Conservation of energy

• Conservation of momentum

• Conservation of force

What power is dissipated by the 4-ohm internal resistance of the battery?

• 0.36 W

• 1.2 W

• 3.2 W

• 3.6 W

Four identical light bulbs K, L, M, and N are connected in the electrical circuit as shown. Rank the current through the bulbs from greatest to least.

• L = M > K = N

• N > K > L = M

• L > M > K > N

• N > L = M > K

Four identical light bulbs K, L, M, and N are connected in the electrical circuit as shown. Bulb M burns out. Which of the following is true?

• All the bulbs go out

• Bulb N goes out but at least one other bulb remains lit

• The brightness of bulb N remains the same

• Bulb N becomes dimmer but does not go out.

In which circuit is the equivalent resistance connected to the battery the greatest?

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The circuit in the figure shown contains two identical lightbulbs in series with a battery. At first, both bulbs glow with equal brightness. When switch S is closed, which of the following occurs to the bulbs?

• Bulb 1: Goes out

  Bulb 2: Gets brighter

• Bulb 1: Gets brighter

  Bulb 2: Goes out

• Bulb 1: Gets brighter

  Bulb 2: Gets slightly dimmer

• Bulb 1: Gets slightly dimmer

  Bulb 2: Gets brighter