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) IV
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?
A) a
B) b
C) c
D) d
In the circuit shown below, 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
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.
The information given above refers to questions 9 and 10
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 \(R_2\) …
