# Download Current - St John Brebeuf

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Name_______________________ Date_____________________ Block ____ Ohm’s Law- A Calculating Personality! Complete the following table. The table has been partially completed to help you. Name and Abbreviation Current Symbol (A) Unit Meter used for measurement Formula I V= I x R ____________ (R) ohm Provide two calculations to prove what happens if a variable is changed in each question. The first one is done for you. 1. What happens to the current if resistance is increased in a circuit? I = V/R I=6/3 I=2A The current DECREASES I = V/R I = 6/5 I = 1.2 A 2. What happens to the voltage if resistance is increased in a circuit? _________________________ 3. What happens to the voltage if resistance is decreased in a circuit? _________________________ 4. What happens to the current if resistance is decreased in a circuit? _________________________ 5. What happens to the voltage if current is decreased in a circuit? _________________________ 6. What happens to the voltage if resistance is decreased in a circuit? _________________________ 7. What happens to the resistance if current is decreased in a circuit? _________________________ 8. What happens to the resistance if voltage is decreased in a circuit? _________________________ Complete the calculations. Be sure to write out the equation, and to include the units! 1) What current would flow through a resistor of 20 ohms connected to a 12 V supply? 5) What supply voltage would be needed to provide a current of 1.2 A through a 40 ohm resistor? 2) What current would flow through a resistor of 40 ohms connected to a 10 V supply? 6) A resistor allows a current of 0.6 A to flow when connected to a 9.6 volt supply. What current would flow if the same resistor was connected to a 12.8 V supply? 3) A 100 ohm resistor is connected to a 20 V supply. What current flows? 7) Calculate the voltage supply needed to produce a current of 12A when used with a 48 ohm resistor 4) What value of resistor would be used to permit a current of 0.2 A to flow using a 6V supply? 8) Calculate the voltage across a 300 ohm resistor when a current of 0.004 A flows through it. 9) Find the size of resistor which would allow limit the current to a value of 0.02 A when connected to an 8 V supply. 12) An 80 V potential difference is measured across a light bulb that has a resistance of 16 Ω. a) What is the current through this light bulb? 10) Calculate the current which will flow when (b) If the light bulb was replaced by a bulb with twice the resistance, what would be the new current through the bulb? a total resistance of 500 ohms is placed in a circuit which has a 15 volt supply. 11) A current through a resistor in a circuit is 1.5 A. If the potential difference across the resistor is 6V, what is the resistance of the resistor? 13) What is the resistance of a toaster if a current of 12.5 A flows through it when it is connected to 120 V? 14) A flashlight bulb has a resistance of 4.0 Ω. What current passes through the bulb if it is connected to 3.0 V? 15) A light bulb has a resistance of 90 Ω. What current flows through the bulb when it is connected to 120 V? ======================================================================== Use the graph below to answer the questions that follow. 1. (a) What happens to the voltage as the current increases? ____________________________ (b) What does this suggest about the relationship between voltage and current? __________________________________________ 2. According to the graph, what happens to the voltage when the current is doubled? ___________________________________________