The ammeter your physics instructor uses for in-class demonstrations has internal resistance r = 75.0 Ω and measures a maximum current of 1.50 mA. The same ammeter can be used to measure currents of much greater magnitudes by wiring a shunt resistor of relatively small resistance, Rshunt, in parallel with the ammeter. (a) Sketch the circuit diagram and explain why the shunt resistor connected in parallel with the ammeter allows it to measure larger currents. (b) Calculate the resistance the shunt resistor must have to allow the ammeter to measure a maximum current of 15.0 A.

Three resistors, R1 = 500 Ω, R2 = 600 Ω and, R3 = 230 Ω, are connected in parallel, and to a 12 V battery to form a closed circuit.  Calculate the total current that would be measured near the battery's positive terminal, before it forks through the separate resistors.

A 10 N resistor (R1) and a 15 O resistor (R2) are connected in parallel to an ideal emf device which provides a potential difference of E = 12 V across its terminals. (a) Determine the electrical energy supplied to the network every second. (b) Suppose the resistors are light bulbs. The filament of light bulb R1 suddenly breaks and R1 is now an open circuit. Does the brightness of light bulb R2 increase, decrease, or remain the same? For the circuit shown below, find the current through the 5.0 0 resistor when S, is closed and S2 is open. R, = 2.02 R2 = 5.0 N S, R, = 1.0 2 R= 3.0 2 3.0 V A ere to search 95% Cc F5 F6 F7 F8 F9 F10 F11 F12 %23 12 3 4. 5 6 8

Consider the circuit shown in Figure Q11(a), a battery Vs = 15V with an internal resistance Rs is connected to a load resistance RL. Rs + Is RL Vs VL Figure Q11(a) (a) If a load resistance RL = 400 Q is connected, VL= 10 V is measured. (i) Find the current Is flowing in the circuit. (ii) Determine the value of the internal resistance Rs. (iii) What is the power dissipated in the load resistor RL?