The electrical network shown below uses a circuit element called a potentiometer (or variable resistor): a) Using Ohm's law, and for different values of the potentiometer resistance, theoretically calculate the voltage and current across the 330 ohm resistor.   Potentiometer resistance Voltage at 330 ohms [V] Current at 330 ohms[mA] 5oo ohms     1 ohm     2 ohms     4 ohms     6 ohms     8 ohms     10 ohms

consider the following circuit composed of four resistors and an ideal battery. each resistor has a resistance of 2.00 ohms. the battery has a terminal voltage of 30.0V. a.) what is the equivalent resistance of this circuit? b.) what is the equivalent current passing through this circuit? c.) what is the voltage drop across R1? d.) what is the current passing through R2?

A parallel combination consisting of resistors A and B is connected across the terminals of a battery. The resistor A has twice the resistance of B. If the current carried by resistor A is I, what is the current carried by resistor B? O a. I/2 O b. 21 O c. I/4 O d. I O e. 41

Testing a Battery Without a Tester The internal resistance says a lot about the state of the battery. To calculate the actual internal resistance of the battery, MULTIMETER proceed as follows: • Measure the source voltage (voltage when no current is flowing) (Vo) and terminal voltage (voltage when current is flowing) (Vc). CE CAT I Calculate the voltage drop across the internal resistance OFF V 200m 20M (V, - Vo- Vc). CURRENT CLAMP 2. 2M • Measure the load current (1). Calculate the internal resistance (R = V/ I). OFF 20- -200K 1mV/A 200- 20K 10mV/A 600 2K ... A ZERO 10 200 10 COM The battery being tested has a CCA rating of 640 A. The battery manufacturer specifies that the maximum internal resistance should not exceed 2.5 + cold cranking amps (CCA) rating of the battery. What is the maximum acceptable internal resistance value for this battery?