T3 PS: Internal Resistance in Circuits

Caitlyn says that Ohm's law is defined as The potential difference across a conductor is indirectly proportional to the current in the conductor at constant temperature.

Is this definition correct or not?

Write only yes or no.

Refer to figure alongside - click on the image to enlarge.

The reading on ammeter A₂ is 0,6 A when switch S is closed.

Calculate reading on voltmeter V_1.

• 2 V

• 2,4 V

• 2,5 V

The reading on ammeter A₂ is 0,6 A when switch S is closed.

Current through the 6 Ω resistor

- click on the image to enlarge.

• 0,4 A

• 2,4 A

• 6 A

Refer to figure alongside - click on the image to enlarge.

The reading on ammeter A₂ is 0,6 A when switch S is closed.

Calculate reading on voltmeter V_2.

• 5 V

• 5,8 V

• 6 V

Refer to figure alongside - click on the image to enlarge.

The reading on ammeter A2 is 0,6 A when switch S is closed.

Calculate the  Emf of the battery. 

• 8,2 V

• 0,8 V

• 9 V

Refer to figure alongside - click on the image to enlarge.

The reading on ammeter A₂ is 0,6 A when switch S is closed.

Calculate the energy dissipated as heat inside the battery if the current flows in the circuit for 15 s

• 12 J

• 15 J

• 0.8 J

Refer to figure alongside - click on the image to enlarge.

Calculate the resistance of the variable resistor.

• 
  

   $2,8\ \Omega$  
  

•  $4\ \Omega$  

•  $0,7\ \Omega$  

Refer to figure alongside - click on the image to enlarge.

The resistance of the variable resistor is now decreased.

State whether the speed at which the wiper turns will INCREASE, DECREASE or REMAIN THE SAME.

Refer to graph alongside - click on the image to enlarge.

Which ONE of the two conductors, X or Y, is ohmic? write only X or Y.

Refer to figure - click on the image to enlarge.

Calculate the ammeter reading when switch S is closed.

• 
  

  $6\ \ \Omega$
  

• 0,33 A

• 3 A