A Direct-Current Circuits and Measurements

Ohms law describes the relationship among voltage, re.sistanee, md current in a resistive. series circuit. In a series circuit, all circuit elements are connected in sequence along a unique path, head to tail, as are the battery and three resistors shown in I igure 2-1- Ohms law can he written in the form 

Kirchhoff s current law slates that the algebraic sunt ot currents at any point in a circuit is zero. This means that the sum of currents coming into a point in a circuit has to equal the sum of the currents going out. Kirch-hoff s voltage law stales that the algebraic sum ol the voltages around a closed conducting path, or loop, is zero. This means that in a closed loop, the sum of the 

Throughout this chapter, this logo indicates an opportunity for online self-study at www. Ihomsonedu.cam/cliemislry/skoog, linking you to interactive tutorials, simulations, and exercises. 

The applications of Kirchhoff s and Ohm s laws to basic Jc circuits are considered in Section 

The power / in watts dissipated in a resistive element is given by the product of the current in amperes and the potential difference across the clement in volts  

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