TYS 5076 C17 DC Circuits

The diagram shows a battery connected to two resistors in parallel. Which shows the readings on the three ammeters?

• A₁: 1.0 A

  A₂: 1.0 A

  A₃: 1.0 A

• A₁: 1.0 A

  A₂: 3.0 A

  A₃: 1.5 A

• A₁: 4.5 A

  A₂: 1.5 A

  A₃: 3.0 A

• A₁: 4.5 A

  A₂: 3.0 A

  A₃: 1.5 A

Four resistors are connected as shown. What is the total resistance of this arrangement?

• 0.5 Ω

• 2 Ω

• 3 Ω

• 9 Ω

The circuit diagram shows a parallel arrangement of resistors. P, Q, R and S are the currents at the points shown.

Which statement is correct?

• P is greater than Q.

• Q is equal to R

• R is greater than S

• S is equal to P

In the circuit shown, the battery lights up all four lamps.

 When the filament of one of the lamps melts, the other three lamps stay on.

Which lamp filament melts?

• A

• B

• C

• D

The diagram shows a simple d.c. circuit. The resistances of the three resistors X, Y and Z are equal. Which statement is correct?

• The current in Y is larger than that in X and equal to that in Z

• The current in Y is larger than that in X and larger than that in Z

• The current in Y is smaller than that in X and equal to that in Z

• The current in Y is smaller than that in X and larger than that in Z

A 12 V battery is connected across a parallel arrangement of two resistors. What is the reading on the ammeter?

• 1.3 A

• 2.0 A

• 4.0 A

• 6.0 A

A circuit connects a 3.0 Ω resistor in series with a tungsten filament lamp. The voltmeter reads 2.5 V and the ammeter reads 500 mA. What is the potential difference across the lamp?

• 1.0 V

• 1.5 V

• 2.5 V

• 4.0 V

A 2 Ω resistor and a 5 Ω resistor are arranged in parallel with a power source.

Which statement about the arrangement is correct?

• The current from the power source is the sum of the currents in each branch.

• The current in a single branch may be found by resistance divided by potential difference

• The current is equal in both branches

• The sum of the potential differences across each resistor is equal to the potential difference across the power source

A circuit contains a battery of electromotive force (e.m.f.) V connected across an arrangement of a 2.0 Ω, a 3.0 Ω and a 4.0 Ω resistor. The current in the 3.0 Ω resistor is 3.0A and the current in the wire leading from the battery is 1₁.

What are the values of V and I₁?

• V = 9.0 V,

  I₁ = 3.0 A

• V = 9.0 V,

  I₁ = 4.5 A

• V = 18.0 V,

  I₁ = 4.5 A

• V = 18.0 V,

  I₁ = 6.0 A

Three 2 Ω resistors can be connected together in series and parallel in different ways.

 

Which total resistance could not be obtained from different combinations of these resistors?