ELECTRICAL POTENTIAL AND CURRENT: V = IR E = PI P = IV C = rPt Series Circuits: Parallel Circuits: VT= Vi + V2+ Vs + ... V, = V1 = V2 = VS = ... 17 = 1 = 12= 13=.. RT = R, + R2 + R3 + ... RT R 1 R 2 Based on the circuit drawn below: (Please use your VIRP chart) R1 = 15 Q V = 120 V R2 = 20 0 R3 = 502 a) What is the value for RT (Total Resistance)? b) What is the total Current IT? c) What is the potential difference V2across R2 ? d) If the same 3 resistors were arranged in parallel with the same battery (voltage), would the total Resistance RT (equivalent resistance) for the circuit increase, decrease or remain the same? Simple Electromagnet - iron nail coiled wire -wire Battery I+ - battery 'VectorStock e) A physics teacher takes some of the wire used to create the given circuit and uses it to make an electromagnet by wrapping it around an iron core and connecting it to a voltage source. Describe one way to increase the strength of the electromagnet