Worksheet: Properties of Electric Charge

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In this worksheet, we will practice converting between the SI unit of charge, the coulomb (C), and the number of electrons that this corresponds to.

Q1:

To start a car engine, the car’s battery moves 3.75×10 electrons through the starter motor. How many coulombs of charge are moved?

Q2:

Static electric charges are commonly measured in microcoulombs (µC) and in nanocoulombs (nC).

How many electrons are required to produce a charge of −2.00 nC?

  • A9.81×10 electrons
  • B8.68×10 electrons
  • C1.08×10 electrons
  • D1.19×10 electrons
  • E1.25×10 electrons

How many electrons must be removed from an initially neutral object for the object to have a net charge of +0.500 µC?

  • A1.34×10 electrons
  • B3.12×10 electrons
  • C4.82×10 electrons
  • D8.28×10 electrons
  • E2.11×10 electrons

Q3:

If 2.90×10 electrons move through a pocket calculator during a full day’s operation, how many coulombs of charge move through it?

Q4:

In an electric storm, a lightning bolt transfers electrons between some clouds and the ground. The total charge of these electrons is 65.0 C. How many electrons are transferred?

  • A2.21×10
  • B4.06×10
  • C23.6×10
  • D2.36×10
  • E9.06×10

Q5:

A copper penny with a mass of 4.8 g is given a net positive charge of 4.0×10 C. To determine the change in the number of electrons in the penny during the charging process, use a value of 63.5 g/mol for the atomic mass of copper and a value of 29 for the atomic number of copper.

How many more protons than electrons are there in the atoms of the penny?

  • A1.3×10
  • B2.5×10
  • C2.5×10
  • D36×10
  • E2.3×10

What is the ratio of the total number of electrons in the penny before the charging process to the number of electrons removed from the penny during the charging process?

  • A1.0×10
  • B15×10
  • C3.6×10
  • D5.3×10
  • E36×10

Q6:

An amoeba contains 5.5×10 protons and has a net positive charge of 0.400 pC. What is the ratio of protons to electrons in the amoeba?

  • A36×10
  • B12×10
  • C87×10
  • D2.2×10
  • E89×10

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