U3.1 – Current & Charge

11

Current & Charge

1 / 15

Which way does current flow in a circuit?

 

2 / 15

Calculate the current in a circuit when the charge is 24 C over 6 seconds.

3 / 15

A smart phone has a charge flowing through it of 2 mC every 5 s. Calculate the current.

4 / 15

The unit for charge is Coulombs, what is this in SI base units?

5 / 15

Calculate the the time taken for a current of 5.2 mA to reach a charge of 25 C.

6 / 15

Calculate the charge of 2.7 A current flowing for 3 minutes.

7 / 15

The charge on an electron is 1.60x10-19 C. Calculate how many electrons are needed to create a charge of 4.2 C.

8 / 15

A battery delivers 5.2 x103 C of electric charge to a circuit in 12 minutes. Calculate the current.

9 / 15

Which piece of equipment can be used to measure the current in a circuit?

10 / 15

How should you connect a current measuring piece of equipment in a circuit?

11 / 15

The current in a circuit depends on the mean drift velocity of the charge carriers. This can be defined by this equation, what is the current if the number of charge carriers doubles?

12 / 15

The current in a circuit depends on the mean drift velocity of the charge carriers. This can be defined by this equation, what is the current if the mean drift velocity of charge carriers halves?

13 / 15

The current in a circuit depends on the mean drift velocity of the charge carriers. This can be defined by this equation, what is the current if the cross sectional area of the material doubles?

14 / 15

What would be the n value of a perfect insulator?

15 / 15

Silver has 7.9x1028 free electrons per m3. Calculate the mean drift velocity of the electrons in a piece of silver wire that has a cross-sectional area of 3.2x10-3 m2 when a current of 13A is flowing.

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