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Diodes II the same experiment we did last chapter with the diodes: measuring the voltage and current at a number of points, then sketching the curve as being the line which connects the points marked on the graph. But there’s no need to do this in the case of a resistor, because we know that resistors follow Ohm’s law. We know that: where R is the resistance, V is the voltage across the resistor, and I is the current through it. So, for any value of resistor, we can choose a value for, say, the voltage across it, and hence calculate the current through it. Figure 7.2 is a blank graph. Calculate and then draw on the graph characteristic curves for two resistors: of values 100 Ω and 200 Ω. The procedure is simple: just calculate the current at each voltage point for each resistor. Figure 7.2 A blank graph for you to fill in — see the text above for instructions 147
Starting electronics Your resultant characteristic curves should look like those in Figure 7.3 — two straight lines. Figure 7.3 this Your efforts with Figure 7.2 should produce a graph something like Take note — Take note — Take note — Take note Resistor characteristic curves are straight lines because resistors follow Ohm’s law (we say they are ohmic) and Ohm’s law is a linear r e l a t i o n s h i p . S o r e s i s t o r c h a r a c t e r i s - tic curves are linear, too. And because they are linear there’s really no point in drawing them, and you’ll never see them in this form anywhere else — we drew them simply to emphasise the principle. 148
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Starting Electronics i
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Starting Electronics Keith Brindley
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Contents Contents Preface vi 1. The
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The very first steps 1 The very fir
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The very first steps potential rewa
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The very first steps Photo 1.2 tool
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The very first steps that electrici
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The very first steps Going back to
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The very first steps tially exist.
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The very first steps by a scientist
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The very first steps Hint: Ohm’s
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The very first steps Electronic com
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The very first steps Larger values
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The very first steps Time out That
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On the boards 2 On the boards In th
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On the boards If you are following
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On the boards Hint: The theoretical
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On the boards Photo 2.2 Inside brea
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On the boards Down the edges of the
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On the boards Hint: The multi-meter
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On the boards of leads should be su
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On the boards it gets older and sta
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On the boards Hint: The bands group
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On the boards In practice, you migh
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On the boards called just ohmmeter)
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On the boards ends. We say resistor
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On the boards we would get: and thi
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On the boards Figure 2.9 A comparat
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Measuring current and voltage 3 Mea
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Measuring current and voltage forme
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Measuring current and voltage Netwo
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Measuring current and voltage Netwo
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Measuring current and voltage Did y
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Measuring current and voltage Figur
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Practically there Measuring current
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Measuring current and voltage Take
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Measuring current and voltage Take
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Measuring current and voltage Hint:
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Capacitors 4 Capacitors You need a
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Capacitors Capacitors We’re going
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Capacitors In our experiments in th
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Capacitors Figure 4.4 A simple resi
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Capacitors Time (seconds) 5 10 15 2
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Capacitors Time (seconds) 5 10 15 2
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Capacitors In a capacitor circuit l
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Capacitors Figure 4.11 An experimen
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Capacitors Time (seconds) Voltage (
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Capacitors plates of the capacitor
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Page 106 and 107: ICs oscillators and filters 5 ICs,
Page 108 and 109: ICs oscillators and filters Photo 5
Page 110 and 111: ICs oscillators and filters We’ve
Page 112 and 113: ICs oscillators and filters an osci
Page 114 and 115: ICs oscillators and filters (a) (b)
Page 116 and 117: ICs oscillators and filters Ouch, t
Page 118 and 119: ICs oscillators and filters output
Page 120 and 121: ICs oscillators and filters Value o
Page 122 and 123: ICs oscillators and filters voltage
Page 124 and 125: ICs oscillators and filters Value o
Page 126 and 127: ICs oscillators and filters Figure
Page 128 and 129: ICs oscillators and filters simple
Page 130 and 131: Diodes I 6 Diodes I We’re going t
Page 132 and 133: Diodes I Photo 6.1 A horizontal pre
Page 134 and 135: Diodes I Now, with a resistance of
Page 136 and 137: Diodes I here. We needn’t know an
Page 138 and 139: Diodes I Figure 6.9 The breadboard
Page 140 and 141: Diodes I but we never said it was a
Page 142 and 143: Diodes I Current (mA) Voltage (V) 0
Page 144 and 145: Diodes I voltages, reverse currents
Page 146 and 147: Diodes I battery voltage of 9 V sim
Page 148 and 149: Diodes I Figure 6.17 The circuit, w
Page 150 and 151: Diodes I Figure 6.19 My results fro
Page 152 and 153: Diodes II 7 Diodes II In the last c
Page 156 and 157: Diodes II We need to draw diode cha
Page 158 and 159: Diodes II Generally, diodes don’t
Page 160 and 161: Diodes II Diode voltage (VD) Resist
Page 162 and 163: Diodes II Diode circuits We’re no
Page 164 and 165: Diodes II Figure 7.9 Waveforms show
Page 166 and 167: Diodes II Filter tips Although we
Page 168 and 169: Diodes II We’ve already seen a de
Page 170 and 171: Diodes II as that from a 230 V a.c.
Page 172 and 173: Diodes II Figure 7.19 The same circ
Page 174 and 175: Transistors 8 Transistors In previo
Page 176 and 177: Transistors Figure 8.1 How to recog
Page 178 and 179: Transistors Black meter lead Red me
Page 180 and 181: Transistors Well, as mentioned earl
Page 182 and 183: Transistors Figure 8.8 A breadboard
Page 184 and 185: Transistors In effect, the transist
Page 186 and 187: Transistors Figure 8.10 transistors
Page 188 and 189: Transistors Hint: Yes, that’s rig
Page 190 and 191: Transistors These two operational m
Page 192 and 193: Analogue integrated circuits 9 Anal
Page 194 and 195: Analogue integrated circuits circui
Page 196 and 197: Analogue integrated circuits Figure
Page 198 and 199: Building on blocs Analogue integrat
Page 200 and 201: Analogue integrated circuits Figure
Page 202 and 203: Analogue integrated circuits As the
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Analogue integrated circuits Figure
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Analogue integrated circuits circui
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Analogue integrated circuits an app
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Digital integrated circuits I 10 Di
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Digital integrated circuits I Logic
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Digital integrated circuits I If we
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Digital integrated circuits I Figur
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Digital integrated circuits I It’
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Digital integrated circuits I The t
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Digital integrated circuits I Trans
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Digital integrated circuits I going
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Digital integrated circuits I OR an
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Digital integrated circuits I For t
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Digital integrated circuits II 11 D
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Digital integrated circuits II A se
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Shutting the ’stable gate Digital
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Digital integrated circuits II gate
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Digital integrated circuits II In o
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Digital integrated circuits II Figu
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Digital integrated circuits II Swit
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Digital integrated circuits II The
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Open the black box Digital integrat
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Digital integrated circuits II Ther
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Glossary Glossary 180 ° out-of-pha
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Glossary bode plots method of showi
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Glossary decibels logarithmic units
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Glossary integrated circuit a semic
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Glossary peak voltage the voltage m
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Glossary squarewave a signal which
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Glossary Components used Resistors
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Glossary Index A ampere, 9 AND gate
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