Current and Charge Vocabulary

Which is equivalent to the ohm?

• J C^–2 s^–1

• J C^–2 s

• J s

• J s^–1

A gas containing doubly-charged ions flows to give an electric current of 0.64 A

How many ions pass a point in 1.0 minute?

• 2.0 × 10¹⁸

• 4.0 × 10¹⁸

• 1.2 × 10²⁰

• 2.4 × 10²⁰

The current in the cell is 10 A as shown

What is the current in the 2.0 Ω resistor?

• 0.35 A

• 2.86 A

• 3.50 A

• 7.14 A

The units of physical quantities can be expressed in terms of the fundamental (base) units of the SI system. In which line in the table are the fundamental units correctly matched to the physical quantity?

• A

• B

• C

• D

In a cathode ray tube 7.5 × 10¹⁵ electrons strike the screen in 40 s. What current does this represent?

Charge of the electron is 1.6 × 10^–19 C.

• 1.3 × 10^–16 A

• 5.3 × 10^–15 A

• 3.0 × 10^–5 A

• 1.2 × 10^–3 A

In the circuit shown in the diagram the cell has negligible internal resistance.

What happens to the reading of both meters when the resistance of R is decreased?

• Reading of ammeter: increases

  Reading of voltmeter: increases

• Reading of ammeter: increases

  Reading of voltmeter: decreases

• Reading of ammeter: decreases

  Reading of voltmeter: increases

• Reading of ammeter: decreases

  Reading of voltmeter: decreases

The current in a wire is 20 mA.

How many electrons pass a point in the wire in 2 minutes?

• 2.5 × 10¹⁷

• 1.5 × 10¹⁹

• 2.5 × 10²⁰

• 1.5 × 10²²

The unit of potential difference can be expressed as

• C s^–1

• J C^–1

• V A^–1

• J A^–1

As the number of resistors increase, the total resistance ___________ and the total current ____________

• Decreases, decreases
• Decreases, increases
• Increases, increases
• Increases, decreases

What is the unit for Current

• C
• Q
• I
• A