Подлежащие подчеркнуто ,а сказуемое выделено.
A rheostat is a resistor whose resistance value may be varied.
Thus,a rheostat is a variable resistor.
Подлежащие подчеркнуто ,а сказуемое выделено.
A rheostat is a resistor whose resistance value may be varied.
Thus,a rheostat is a variable resistor.