Electric circuits

Electrical current is defined as

I is the

R is the.........

V is the........

The following diagram shows three resistors R1 = 2 Ω, R2 = 3 Ω and R3 = 4 Ω, connected to a switch and a battery. When the switch is opened the voltmeter reads 12 V, but when the switch is closed the reading drops to 11 Ω.

What is the emf of the battery?

• 12 V
• 11 V
• 13 V
• 14 V

The following diagram shows three resistors R1 = 2 Ω, R2 = 3 Ω and R3 = 4 Ω, connected to a switch and a battery. When the switch is opened the voltmeter reads 12 V, but when the switch is closed the reading drops to 11 Ω.

Calculate the equivalent external resistance.

• 9 Ω
• 7 Ω
• 6 Ω
• 5 Ω

The following diagram shows three resistors R1 = 2 Ω, R2 = 3 Ω and R3 = 4 Ω, connected to a switch and a battery. When the switch is opened the voltmeter reads 12 V, but when the switch is closed the reading drops to 11 Ω.

Determine the reading of the ammeter.

• 2 A
• 3 A
• 1,22A

• 5 A

The following diagram shows three resistors R1 = 2 Ω, R2 = 3 Ω and R3 = 4 Ω, connected to a switch and a battery. When the switch is opened the voltmeter reads 12 V, but when the switch is closed the reading drops to 11 Ω.

Calculate the internal resistance of the battery.

• 0,822Ω

• 2 Ω
• 3,12 Ω

• 4 Ω