DC circuits

The resistors have values of 3Ω and 6 Ω. Given that the reading in the ammeter 0.20 A, calculate the potential difference across the 6 Ω resistor.

(a)  

Answer explanation

Use R = V/I

The ammeter the picture shown reads 0.2 A. State the current at point Z.

(a)  

Answer explanation

Remember the series circuit rule for current: the current is the same at all points.

Tags

NGSS.HS-PS2-5

The ammeter the picture shown reads 0.2 A. Calculate the potential difference between X and Z.

(a)  

Answer explanation

Use R = V/I

A 3 m long wire with a cross-sectional area of A has a resistance of R. What is the resistance of a 9 m long wire with a cross-sectional area of 2A?

• 2 R

• 3 R

• 1.5 A

• 6 R

The diagram shows two resistors, P and Q, in series. The ammeter reads 0.20 A. Voltmeter X reads 1.2 V and voltmeter Y reads 2.0 V.

Calculate the potential difference across resistor P.

(a)  

Answer explanation

Voltmeter Y is measuring voltage for both resistors = 2.0 V

Voltmeter X is measuring voltage for resistor Q only = 1.2 V

The current of 6 A flows in the circuit shown. It splits up when it enters parallel branches of resistors.

What is the reading on the ammeter?

• 2 A

• 3 A

• 6 A

• 12 A

The total current through this circuit is

• 0.02 amps

• 0.09 amps

• 50 amps

• 9 amps

The diagram shows two resistors, A and B, connected in series. The resistance of A is 7.0 Ω.

The ammeter reads 0.20 A. Calculate the potential difference across resistor A.

(a)  

Answer explanation

Use R = V/I

A Series circuit is shown in the picture. The resistors have values of 3Ω and 6 Ω. The ammeter reading is 0.20 A. Calculate the E.M.F of the cell.

(a)  

Answer explanation

To calculate the total resistance of resistors in series, you add them all.

The diagram shows two resistors, P and Q, in series. The ammeter reads 0.20 A. Voltmeter X reads 1.2 V and voltmeter Y reads 2.0 V.

Calculate the resistance of resistor P.

(a)  

Answer explanation

Use R = V/I