Activity 4 Directions: Using equation 10, derive the formula for each of the given quan Unknown Quantity ARCDerived Formula Po KENT OF ED AT T To REMEMBER uno Current is the ratio of charge to time. Voltage is the difference in the between two points. Resistance is the ratio of voltage to current. For a material that obeys Ohm's Law called an ohmic material, the p difference is directly proportional to current. > An ideal source of EMF has a constant potential difference independe while terminal voltage depends on current. CHECKING YOUR UNDERSTANDING Directions: Solve for the given problems. Show your complete solutions. Exp answers into 3 significant figures. 1. The terminal voltage of the battery in figure 4 is 16.6 18.0 V 3.00 A 3.00 A