A
Find the correct variant. Remember it:
a resistor is used
to measure the resistance
to reduce the current
tochange theresistance
toproduceIRvoltagedrop
when current passes through a resistor
itstemperature drops
itstemperature rises
resistors are rated
inohms
involts
inwatts
power is given
in amperes
in watts
fixed resistors have
a constant value
a variable value
the value of a variable resistor
is fixed
is varied
a two ohm resistor rated as a 8,000,000-W resistor
hasa current-carryingcapacityequalto2,000amp
hasa current-carryingcapacityequalto200amp
the higher the value of current
the lower is the temperature of a resistor
the higher is the temperature of a resistor
В
Finish the sentences using the words with the opposite meaning:
1. The value of a fixed resistor is constant while . . . . . . . 2. Current-carrying capacity is given in amperes while . . . . . . . 3. The lower the value of current the lower is the temperature of a resistor while 4. An electric source produces energy while. . . . .
Answer the following questions:
1. What is a resistor used for? 2. When does the tem - perature of a resistor rise? 3. What element is used to change the value of voltage? 4. How are resistors rated? 5. What types of resistors do you know? 6. When does a resistor get open? 7. What does an open resistor result in? 8. What is the difference between a fixed resistor and a variable resistor? 9. How much is the current-carrying ca - pacity of a 2 ohm resistor? 10. What resistors have a variable value?
4) Grammar activities
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