Ohms Law and Internal Resistance

If you keep the resistance in a circuit constant and you increase the voltage supply the current in the circuit will

• Stay the same

• Increase

• fall

A battery is a group of cells

• True

• False

What is the terminal voltage?

• The voltage across the external circuit

• The total voltage supplied by the battery before any is dropped across the internal resistance

• meh

A circuit has a battery rated as 6V, when you measure the voltage across its terminals you get a reading of 5.8V if the current in the circuit is 2A what is the internal resistance of the battery?

• 15 ohms

• 0.1 ohms

• 0.2 ohms

• 1 ohms

EMF is the total energy supplied to the internal and external resistances

• False

• True

Three 12 Ohm resistors are in parallel with each other what is the resultant resistance?

• 36 Ohms

• 8 Ohms

• 12 Ohms

• 4 Ohms

A 25 Ohm resister is connected across the terminals of a battery which has an internal resistance of 0.6 Ohms. What is the EMF of the battery if the current in the circuit is 0.75A?

• 18.5V

• 182V

• 25V

• 19.2V

A 20 Ohm resister is connected across the terminals of a battery which has an internal resistance of 0.6 Ohms. What is the EMF of the battery if the current in the circuit is 0.5A?

• 10.3V

• 10V

• 12V

• 20.6V

A 5 Ohm resister is connected across the terminals of a battery which has an internal resistance of 0.1 Ohms. What is the EMF of the battery if the current in the circuit is 0.20A?

• 5.2V

• 3.0V

• 1.02V

• 5V

Calculate the internal resistance r when R1 = 5Ω and R2 = 3Ω Emf = 6.6V and V is 6V.

• 1.0 Ω

• 5.0 Ω

• 0.8 Ω

• 0.36 Ω