Step-by-step explanation:
so I suppose uve learned V=IR
which basically means the voltage across THAT specific resistor is equivalent to the current passing througj THAT resistor
so the answers for first three questions would be
V¹=IR¹
V²=IR²
V³=iR³
Plz note that those number are not actually the powers
as all resistor are in a series, NOT in parallel, so that the overall resistor would be R¹+R²+R³*
so
V(in total)=I(R¹+R²+R³)
hope thats easy for u to understand
*if resistor are in parallel, the total resostance would be
1/R=1/R¹+1/R²+1/R³+...
R is the total resistance
also the ¹,²,³ are not actual powers, they are representing the different resistor one, two and three