MATERIALS: Salt,zinc(-),copper(+),wire,water And A voltmeter. STEP 1: Connect A (-)Wire To The Zink And A (+)wire To The Copper (you Can Also Use A Cooper Wire As The Cooper). STEP 2: Get A Cup Or Container Add Water And 2-tablespoon Of Salt. STEP 3: Dip The Zinc And The Copper Into The Salt-Water. STEP 4: Connect The Wire To A voltemeter And Comment The Voltage You Got.