Electric Circuits

The diagram above represents a circuit consisting of two resistors connected to a source of potential difference.

What is the current through the 20.-ohm resistor?

• 12 A

• 6.0 A

• 4.0 A

• 0.25 A

The circuit diagram above represents four resistors connected to a 12-volt source. What is the total current in the circuit?

• 2.0 A

• 0.50 A

• 24 A

• 8.6 A

The diagram above represents an electric circuit consisting of four resistors and a 12-volt battery.

What is the current measured by ammeter A shown in the diagram?

• 4.0 A

• 72 A

• 2.0 A

• 0.50 A

The diagram below represents an electric circuit consisting of four resistors and a 12-volt battery.

What is the equivalent resistance of the circuit shown?

• 72 ohms

• 3.0 ohms

• 0.33 ohms

• 18 ohms

Find total resistance
total current
and the voltage through resistor 3.

• 60 Ohms, 0.4 A,  8 V
• 60 Ohms, 2.5 A,  4 V
• 90 Ohms, 2.5 A, 24 V
• 60 Ohms, 0.4 A, 24 V

The circuit diagram shows 3 light bulb in series. What happens when one of the light bulb blows.

• The remaining bulbs remain on.

• The remaining bulbs are off.

• The remaining bulbs becomes brighter.

• The remaining bulbs becomes dimmer.

The circuit shows three bulb in parallel. What happens when one of the light bulb is spoilt.

• The remaining bulbs remain on.

• The remaining bulbs are off.

• The bulbs become brighter.

• The bulbs become dimmer.

How are ammeter and voltmeter connected in a circuit?

• Ammeter : Series

  Voltmeter: Parallel

• Ammeter : Parallel

  Voltmeter: Parallel

• Ammeter : Series

  Voltmeter: Series

• Ammeter : Parallel

  Voltmeter: Series

The circuit shown contains three ammeters X, Y and Z.

Which ammeter has the largest reading?

• X

• Y

• Z

• They all have the same reading.

The diagram shows a circuit containing three ammeters P, Q and R.

Which statement about the readings on the ammeters is correct?

• The reading on P is equal to the reading on Q.

• The reading on P is equal to the reading on R.

• The reading on Q is greater than the reading on P.

• The reading on Q is greater than the reading on R.