I am helping my little one with a science project and need some input.

We strung Nichrome coils between two stripped power cord wires. We are trying to get them hot enough to light a match. Thus far all that has worked is an 18volt 1500mah portable drill battery. But we need to use household batts

Now doing the math 18volts times 1.5 amps yields 27 watts. Am I correct in assuming that all I need to do is that same math on household batts to get the same amount of watts.