9 Measuring ResistanceResistance – slows down current, adding components to a circuit increases resistanceResistance is measured in units of ohms (Ω)More resistance = Less current = Less lightIn a series circuit, add up all resistance to get total.
14 How much voltage gives 5 amps of current through a 3 Ω light bulb? I = V/RV = (5A) (3Ω)V = 15V
15 How much current flows in a circuit with a 1 How much current flows in a circuit with a 1.5 volt battery and three 1 ohm resistances (bulbs) in series?I = V/RI = (1.5V) / (3Ω)I = .5A
16 What is the voltage drop across each resistor in the circuit? In a series circuit, voltage is shared between all the points9V/3 = 3V
17 A light bulb with a resistance of 1. 5Ω is connected to a 1 A light bulb with a resistance of 1.5Ω is connected to a 1.5V battery in the circuit. Calculate the power used by the light bulb?P = IVI = V/RI = (1.5V) (1.5Ω)I = 2.25AP = (2.25A) (1.5V)P = W