1. The problem statement, all variables and given/known data When two same lamps are connected with the same battery. Their lighting will be greater when they are connected in series or parallel? 2. Relevant equations Series U=U1+U2+U3+... I=I1=I2=I3... Parallel U=U1=U2=U3... I=I1+I2+I3+... 3. The attempt at a solution The answer is when they are connected in parallel. But why? Is it related to the tension or intensity or power?