Work on the topic and do the tasks

Get ready!

Before you read the passage, talk about these questions.
1 What is the opposite of a negative charge?
2 What unit measures the speed at which current
changes direction?

Reading

Read the textbook excerpt. Then, complete the table.

Introduction to Electricity

Direct current
Direct current is the type of electricity that comes
from batteries. It moves from negative to positive.
Alternating current 
Alternating current is when the polarity switches back
and forth between positive and negative. The speed
at which the polarity changes is measured in hertz.
AC can be switched to DC using a transformer or
diode. This process is known as rectification.
Additional Terms
Capacitance is the ability to store a quantity of
electricity in an electric field. Inductance is the
ability to store electricity in a magnetic field. The
impact of capacitors and inductors on an alternating
current is known as reactance. Impedance is a way
of assessing how easily electricity passes through
an electrical device.

Vocabulary
Match the words (1-5) with the definitions (A-E).
1 _ direct current
2 _ inductance
3 _ negative
4 _ positive
5 _ reactance
A having the electrical charge of a proton
B the opposition to a change in voltage or electrical current, as a result of capacitance or inductance
C the ability to store electricity in a magnetic field
D a flow of electrical current moving in one direction
E having the electrical charge of an electron

Read the sentence pair. Choose where the words best fit the blanks.
1 impedance / hertz
A ________measure the pace at which polarity changes.
B ________measures how difficult it is for electricity to move through electrical equipment.
2 alternating current / capacitance
A The flow of electricity continually changes direction with________.
B _____ is the ability to store electricity in an electric field.
3 transformer / polarity
A    _________ is when something has either a positive or negative electrical charge.
B A ________is a piece of equipment that changes the voltage of electricity.