Electricity 3
- Which one of the circuits shown in the diagram below can be used to determine the resistance of R?
(A) I
(B) II
(C) III
(D) IVD is correct
- A car's starter motor draws a current of 100A at 12,0V when starting the engine. The mechanical power required to turn the engine is 960W. At what rate is energy from the battery converted to non-mechanical forms of energy?
(A) 240W
(B) 960W
(C) 1200W
(D) 1440WA is correct
- In the circuit shown below one of the bulbs blew. The result was that all bulbs stopped glowing. Which bulb blew?
(A) bulb a
(B) bulb b
(C) bulb c
(D) bulb dC is correct
- Three resistors are connected to a battery as shown in the diagram. At which point in the circuit is the current the smallest?
(A) a
(B) b
(C) c
(D) dC is correct
- In the circuit shown, the resistance of the ammeter, the battery and the connecting wires are negligible. The voltmeter has a very high resistance. The ammeter reads 1,5A. What is the reading on the voltmeter?
(A) 4V
(B) 6V
(C) 8V
(D) 12VB is correct
- Two resistors are connected in parallel as shown in the diagram. The current flowing through the ammeter is:
(A) 0,6A
(B) 1,5A
(C) 2,5A
(D) 14,4AC is correct
- Consider the circuit shown to the right. If switch S is closed, the readings on the voltmeter and ammeter will change as follows:
Answer voltmeter reading ammeter reading (A) becomes zero remains the same (B) becomes zero increases (C) remains the same decreases (D) decreases increases B is correct
- The circuit below shows two identical bulbs, L and M, which are connected to a battery and a variable resistor R. How will the brightness of the bulbs be affected if the resistance of R is increased?
Answer Bulb L Bulb M (A) dimmer brighter (B) dimmer dimmer (C) dimmer the same (D) brighter the same A is correct
The information given refers to questions 9 and 10:
The battery in the circuit has an internal resistance r and an emf E. The resistance of the ammeter and the conductors is negligible and the voltmeter has a high resistance
- When the switch S is closed, the …
Answer Voltmeter reading Ammeter reading (A) decreases decreases (B) decreases increases (C) increases decreases (D) increases increases B is correct
- When the switch S is closed the power in the resistors R1 and R2 …
Answer Power in R1 Power in R2 (A) decreases decreases (B) decreases increases (C) increases decreases (D) increases increases C is correct