Ch1 L3 - Ohm's law for closed circuit

• 2.7 A

• 0.5 A

• 0.8 A

• 2.9 A

A battery has an emf of 𝑉 volts, and its internal resistance equals 2r.If the battery is connected to an external resistance of 7r, what is the terminal potential difference of the cell?

• 2/9 V

• 7/9 V

• 9/7 V

• 9/2 V

An electric source has an internal resistance r and its emf equals 10 V, then the potential difference between its terminals when connected in a circuit

• equals 10 V

• • is less than 10 V

• is higher than 10 V

• The answer cannot be determined.

A resistor of 5 Ω is connected between the terminals of a battery. The terminal voltage is 11 V, and the internal resistance of the battery is 0.5 Ω. What is the emf of the battery?

• 12.1 V

• 11 V

• 2.5 V

• 1.1 V

In the circuit shown below, the voltmeter reading is .....

• 2.7 V

• 4.3 V

• 3.7 V

• 3.3 V

• 11/7

• 3/11

• 11/3

• 7/11

The diagram below shows how the potential difference across a battery changes with respect to the current in an electric circuit. The internal resistance of the battery equals

In the circuit shown below, the current passing through the circuit when switch K is closed is higher than the current passing through the circuit when switch K is open by 1 A. The emf of the battery then equals .......

• 8V

• 4V

• 1V

• 0.5 V

• 1/4 V

• 1/3 V

• 4/3 V

• 3/4 V

Which of the following happens to the reading of the ammeter and the reading of the voltmeter when the switch K is closed?

• The ammeter reading increases, while the voltmeter reading increases.

• The ammeter reading increases, while the voltmeter reading decreases.

• The ammeter reading decreases, while the voltmeter reading decreases.

• The ammeter reading decreases, while the voltmeter reading increases.