- Which one of the circuits shown in the diagram below can be used to determine the resistance of \(R\)?
D is correct
- A car's starter motor draws a current of \(100\; A\) at \(12,0\; V\) when starting the engine. The mechanical power required to turn the engine is \(960\; W.\) At what rate is energy from the battery converted to non-mechanical forms of energy?
(A) \(240\; W\)
(B) \(960\; W\)
(C) \(1200\; W\)
(D) \(1440\; W\)
- 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 d
- Three resistors are connected to a battery as shown in the diagram. At which point in the circuit is the current the smallest?
- 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 \(1,5\; A.\) What is the reading on the voltmeter?
(A) \(4\; V \)
(B) \(6\; V\)
(C) \(8\; V\)
(D) \(12\; V\)
- Two resistors are connected in parallel as shown in the diagram. The current flowing through the ammeter is:
(A) \(0,6\; A\)
(B) \(1,5\; A\)
(C) \(2,5\; A\)
(D) \(14,4\; A\)
- 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
- 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
- When the switch \(S\) is closed, the …
Answer Voltmeter reading Ammeter reading (A) decreases decreases (B) decreases increases (C) increases decreases (D) increases increases
- When the switch \(S\) is closed the power in the resistors \(R_1\) and R2 …
Answer Power in \(R_1\) Power in \(R_2\) (A) decreases decreases (B) decreases increases (C) increases decreases (D) increases increases