Which circuit can be used to find the resistance of the lamp?
-
The diagram shows identical lamps X and Y connected in series with a battery. The lamps light with normal brightness.
A third lamp Z is connected in paralled with lamp X.
What happens to the brightness of lamp Y?- brighter than normal
- normal
- dimmer than normal
- very dim (cannot be seen)
In the circuit shown, at which point is th current the smallest?
- A
- B
- C
- D
The diagram shows a simple d.c. circuit. The resistance of the three resistors X, Y and Z are equal.
The current in- Y is larger than X and equal to Z.
- Y is larger than X and larger than Z.
- Y is smaller than X and equal to Z.
- Y is smaller than X and larger than Z.
The diagram shows a circuit in which all the switches are open.
Which switch positions would obtain a resistance of 6 ohms between X and Y?- S1: closed ; S2: closed ; S3: closed
- S1: closed ; S2: closed ; S3: open
- S1: closed ; S2: open ; S3: closed
- S1: closed ; S2: open ; S3: open
The diagram shows part of a circuit.
Which component can be connected between X and Y so that the brightness of the lamps may be varied?
- A
- B
- C
- D
The circuit shows identical lamps connected to a cell.
Which pair of equations is correct for this circuit?- Potential difference: V = V1 + V2 + V3 ; Current: I = I1 + I2 + I3
- Potential difference: V = V1 + V2 ; Current: I = I1 + I2 + I
- Potential difference: V = V1 + V2 ; Current: I = I1 + I3
- Potential difference: V = V3 ; Current: I = I3
The diagram shows a circuit.
The reading of ammeter A2 is 1 A and of A4 is 3 A.
What are the readings of ammeters A1 and A3?- A1: 1.5 A; A3: 0.5 A
- A1: 2 A; A3: 1 A
- A1: 3 A; A3: 1 A
- A1: 3 A; A3: 2 A
In the circuit shown, component Y can gradually change the brightness of the lamp.
What is component Y?- A battery
- A resistor
- A switch
- A variable resistor
Diagram 1 shows three lamps, X, Y and Z, in a circuit. When the only switch in the circuit, S, is turned on, all three lamps are at full brightness. Diagram 2 shows the same circuit but the switch S is turned off.
What is observed with the circuit as shown in diagram 2?- All three lamps are out.
- X is bright, Y and Z are dim.
- X is bright, Y and Z are out.
- X is out, Y and Z are bright.
The circuit diagram shows four identical resistors connected in a series with a 12 V battery.
What are the readings on voltmeters V1 and V2?- V1: 1 V; V2: 2 V
- V1: 2 V; V2: 4 V
- V1: 3 V; V2: 6 V
- V1: 4 V; V2: 8 V
Two resistors are connected in parallel as shown.
What is the reading on the ammeter?- 1.5 A
- 3 A
- 12 A
- 24 A
In the circuit shown, the brightnessof the lamp can be altered by changing the resistance of the variable resistor, R.
This is because varying the resistance changes......................- the current flowing in the circuit.
- the electromotive force (e.m.f) of the battery.
- the resistance of the bulb.
- the temperature of the battery.
The diagram shows a simple d.c. circuit. The resistance of the three resistors X, Y and Z are equal.
How do the currents in X and Z compare with the current in Y?- The current in X is larger; The current in Z is smaller
- The current in X is larger; The current in Z is equal
- The current in X is smaller; The current in Z is larger
- The current in X is smaller; The current in Z is equal
The diagram shows a circuit in which PQ is a piece of resistance wire with a total resistance of 12 ohms. R is a sliding contact joined to P with normal contact wire.
What will be seen as R is moved along the resistance wire from Q towards P?- The lamp filament will blow.
- The lamp will become brighter.
- The lamp would become less bright.
- The lamp would remain at constant brightness.
A battery lights all four lamps as shown in the circuit diagram.
Which lamp, if removed, would cause the other lamps to go out?- A
- B
- C
- D
The diagram shown a circuit.
Which combination of switches must be closed so that only lamps Q, R and S are lit?- 1, 2, 3
- 1, 2, 4
- 1, 3, 5
- 1, 4, 5
