kirchoff's law and circuits

Points P and Q are connected to a battery of fixed voltage. As more resistors R are added to the parallel circuit, what happens to the total current in the circuit?

• increases

• remains the same

• decreases

• drops to zero

Current flows through a lightbulb. If a wire is now connected across the bulb, what happens?

• all the current continues to flow through the bulb

• half the current flows through the wire, the other half continues through the bulb

• all the current flows through the wire

• none of the above

Two lightbulbs A and B are connected in series to a constant voltage source. When a wire is connected across B, bulb A will:

• glow brighter than before

• glow just the same as before

• glow dimmer than before

• go out completely

What happens to the voltage across the resistor R4 when the switch is closed?

• increases

• decreases

• stays the same

Which resistor has the greatest current going through it? Assume that all the resistors are equal.

• R1

• both R1 and R2 equally

• R3 and R4

• R5

What does Kirchhoff's Voltage Law (KVL) state?

• 
  The sum of all currents entering a junction must equal zero.

• The total resistance in a series circuit is equal to the sum of individual resistances.

• The sum of all voltages around a closed loop must equal zero.

• 
  The voltage across each component in parallel is different.

What is the magnitude of the current, I, traveling down through the center wire? ( for 3 points)

• 1/6

• 1/3

• 3/6

• 6/3

Is the potential at "B" higher or lower than "A's" potential? (for 3 points)

• "B" is higher than "A"

• "B" is lower than "A"

• Can't tell from the given information.

Calculate the value of V1 and V2

• 1. 4V, 6V

• 1. 5V,6V

• 1. 6V, 7V

• 1. 7V, 8V