ࡱ> {}z7 -bjbjUU `7|7| 7ldddx>">">"8v"4"xFv#####$$ $OEQEQEQEQEQEQE$vG IuEEd$$$$$uE%##E%%%$d8#d#OE%$OE% %S0=Lds?## 0> Wx>"?%ds>s?E0F>"J%"Js?%xx Ohms Law Georg Ohm 1787-1854 Quiz No.AnswerComments1234567891011121314151617181920 Notes Ohms Law Worksheet 1. Define Ohms Law _________________________________________________________________________________________________________________________________________________________ Why is it better for the batteries to use the kilo ohm rather than an ohm range of resistors? _________________________________________________________________________________________________________________________________________________________Calculate data for the following chart and use the program to check the values, use I=V/R Resistor/W1 k W2 k W3 k WVoltage/VCurrent/ACurrent/ACurrent/A6.06.04.53.01.5 Now try plotting a graph of Voltage against Current for each resistor on the same graph.  Measure the gradient of each line, do you notice anything? Ohms Law Practical Connect up the circuit and take readings of current and voltage.  Now change the values of the resistor and the number of batteries and complete the following table Resistor1 k W2 k W3 k WNumber of BatteriesVoltage /VCurrent /mACurrent /mACurrent /mA43210 Are the values exactly the same as the ones in the worksheet or program, if not can you explain this? Now try plotting a graph of Voltage against Current for each resistor on the same graph  Measure the gradient of each line, do you notice anything? The circuit below can also be used for a full investigation of Ohms Law for various components  Diode Practical  Take a reading of the milliammeter, reverse the direction of the diode and then take another reading. What did you notice? Diode Characteristics  Connect up the circuit as shown, and vary the value of the variable resistor. Draw up a table of current and voltage. Reverse the battery and record these readings. Plot the current against forward and reverse voltage. Check with your teacher to see what the graph should look like. ALTERNATING CURRENT A.C. No.AnswerDescription12345 Discussion (1) Sketch what you think A.C. would look like after it has been passed through a diode. (2) How long does it take to charge up a typical mobile phone? (3) What is the big heavy object inside a mobile phone charger? (4) Why does the charger get hot at the beginning of the charging cycle? (5) Where in the home would you find D.C. power supplies? Electrical Problems/Homework/Test A bulb of 10 ( carries a current of 1.2 A, what voltage is across the bulb? A car's headlamps pass a current of 15 A. If the car's battery is 12 V, what is the overall resistance of the headlamp circuit? A 1 M( resistor is attached across a 12 kV power supply, what current will flow? A hand-held neon screwdriver passes a current of 0.01 mA when a 240 V terminal is touched, what is the total resistance of the circuit? A 12 V battery is connected across a pair of 4 ( and 2 ( resistors in series. What current flows in each resistor, and what is the voltage across each one?  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