Lesson Worksheet: Types of Electric Current Science

In this worksheet, we will practice describing the main types of electric current and identifying which sources produce them.

Q1:

A working dynamo is connected to a circuit as a source of electric current. What kind of electric current is in the circuit?

  • AAlternating current
  • BDirect current

Q2:

A dynamo transfers kinetic energy to electrical energy.

Complete the following: A dynamo produces current.

  • Adirect
  • Balternating

Q3:

The graph below shows the electric current over time for two different circuits. Which of the following sentences is correct?

  • ABoth line 1 and line 2 represent an electric current that is constant.
  • BLine 1 represents an electric current that periodically reverses direction.
  • CLine 2 represents an electric current that periodically reverses direction.
  • DLine 1 represents an electric current that is constant.
  • EBoth line 1 and line 2 represent an electric current that periodically reverses direction.

Q4:

A company is making circuits. They need their circuits to have an electric current that periodically reverses direction. What is their best choice for a source of electric current?

  • AA dynamo
  • BA chemical battery
  • CEither a dynamo or a chemical battery

Q5:

A chemical battery is connected to a circuit as a source of electric current. What kind of electric current is in the circuit?

  • AAlternating current
  • BDirect current

Q6:

A company is making circuits. They need their circuits to have a constant electric current that does not change direction. What is their best choice for a source of electric current?

  • AA dynamo
  • BA chemical battery
  • CEither a dynamo or a chemical battery

Q7:

Which of the following sentences correctly describes direct current?

  • ADirect current has a variable magnitude and always has the same direction.
  • BDirect current has a constant magnitude and always has the same direction.
  • CDirect current has a variable magnitude and its direction can reverse.
  • DDirect current has a constant magnitude and its direction can reverse.

Q8:

A chemical battery transfers chemical energy to electrical energy.

Complete the following: A chemical battery produces current.

  • Aalternating
  • Bdirect

Q9:

Which of the following sentences correctly describes alternating current?

  • AAlternating current has a constant magnitude and always has the same direction.
  • BAlternating current is a current that never reverses direction.
  • CAlternating current is a current that periodically reverses direction.
  • DAlternating current is a current that can sometimes reverse direction.

Q10:

The graph below shows the electric current over time for two different circuits. Which one of the following sentences is correct?

  • ALine 1 represents a direct current and line 2 represents an alternating current.
  • BLine 1 represents an alternating current and line 2 represents a direct current.
  • CThere is not enough information to tell which line represents which type of current.

This lesson includes 15 additional questions for subscribers.

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