C. Circuit C l. The circuit shown is referred to as a Wheatstone Bridge. In practice, this circuit is used to measure physical quantities that depend on resistance values, like temperature and light intensity. wire ab PHYS 410 Elecn'ic Circuits Lab 3 2. Startwith =20V,R1=20.0 Q, R; = 15.0 (1, R3=8.0 Q, andR4 =18.0 9. Use the 3. ammeter to find the current in wire ab. Is the conventional current in ab directed to the left or to the right? Give your answer in the box below. Now change the value of the emf. Does changing the emf affect the value of Jab? The Wheatstone bridge is useJl for taking measurements when the current in wire ab is zero. This is referred to as a balanced bridge. Adjust the value of R4 to balance the bridge and record your value below. Keeping the bridge balanced, change the value of the emf. Does changing the emf a'ect the value of lab? D. Circuit D 1. The circuit shown below is called a three-wire circuit. All five resistors have a voltage of 12.0 V, so you can use Ohm's Law to find their currents. However, finding the remaining currents (there are nine of them) is a tedious task. Use the simulation to find all currents values. For each current, indicate if the current is directed to the left or right, or if it is directed up or down. Fill in the table at the bottom. There are total of 14 currents. 12 12.0 V R1 = 11.5 0 R, = 28.3 0 R, = 14.0 0 T 12.0 V R. = 19.2 0 R. -9.20 WW 13 Magnitude Direction I1 12 Is 14 Is 16 PHYS 410 - Electric Circuits Lab Magnitude Direction 17 Is I10 /12 I13 /14 To submit: EXCEL Charts This handout