5.2 Electric currents
5.2.4 Understanding circuits Conventions and approaches I use the IEC circuit symbol convention, as used in the DP Physics Data Booklet. Other resources - especially those most often used in the United States - often use the ANSI symbols, which differ for example in that resistors are shown as a sawtooth line. This is the case for US-based online apps such as Phet for example, and teachers should flag this difference...