Home » Archimedes archive » Acorn User » AU 1997-01 B.adf » Regulars » StarInfo/Allen/!Ignotum/Formulae/Formulae/Elec
StarInfo/Allen/!Ignotum/Formulae/Formulae/Elec
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Archimedes archive » Acorn User » AU 1997-01 B.adf » Regulars |
| Filename: | StarInfo/Allen/!Ignotum/Formulae/Formulae/Elec |
| Read OK: | ✔ |
| File size: | 072C bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
# Physics > Electricity # New entries should take the form of: # Formula # Note 1 # Note 2 # Note 3 # Note 4 # Note 5 # Formula # Note 1 # And so on... # To fit snugly into the window, each line should be no longer # than 42 characters. # There is a limit of 25 formulas per topic. # Any notes should be made here, at the beginning and should # be preceeded by a hash (#). V=IR Where: V=voltage (V) I=current (A) R=resistance (Ohms) I=AvnQ Where: I=current, A=area v=velocity of charged carriers n=charged carrier density Q=charge R=rl/A Where: R=resistance (Ohms) r=resistivity for material l=length of material A=cross sectional area of material R=R1+R2+R3... Where: R=total resistance R1, R2, R3... are resistors in series 1/R=(1/R1)+(1/R2)+(1/R3)... Where: R=total resistance R1, R2, R3... are resistors in parallel Q=It Where: Q=charge (C) I=current (A) t=time (s) V=E/Q Where: V=voltage (V) E=energy (J) Q=charge (C) E=ItV Where: E=electrical energy (J) I=current (A) t=time (s) V=voltage (V) P=E/t Where: P=power (W) E=energy (J) t=time (s) P=VI Where: P=power (W) V=voltage (V) I=current (A) C=Q/V Where: C=capacitance of a capacitor (F) Q=charge (C) V=voltage (V) E=�QV Where: E=energy stored in a capacitor (J) Q=charge (C) V=voltage (V) 1/C=(1/C1)+(1/C2)+(1/C3)... Where: C=total capacitance (F) C1, C2, C3... are capacitors in series C=C1+C2+C3... Where: C=total capacitance (F) C1, C2, C3... are capacitors in parallel Q=Q0e^(-t/RC) In the discharge of a capacitor: Q=charge (C) Q0=initial charge t=time (s), e=2.718... RC=resistance�capacitance=time constant C=e0erA/d For a parallel plate capacitor: C=capacitance (F) e0=permittivity of free space er=relative permittivity A=plate area, d=distance between plates
00000000 23 20 50 68 79 73 69 63 73 20 3e 20 45 6c 65 63 |# Physics > Elec| 00000010 74 72 69 63 69 74 79 0a 0a 23 20 4e 65 77 20 65 |tricity..# New e| 00000020 6e 74 72 69 65 73 20 73 68 6f 75 6c 64 20 74 61 |ntries should ta| 00000030 6b 65 20 74 68 65 20 66 6f 72 6d 20 6f 66 3a 0a |ke the form of:.| 00000040 23 20 20 20 20 20 46 6f 72 6d 75 6c 61 0a 23 20 |# Formula.# | 00000050 20 20 20 20 4e 6f 74 65 20 31 0a 23 20 20 20 20 | Note 1.# | 00000060 20 4e 6f 74 65 20 32 0a 23 20 20 20 20 20 4e 6f | Note 2.# No| 00000070 74 65 20 33 0a 23 20 20 20 20 20 4e 6f 74 65 20 |te 3.# Note | 00000080 34 0a 23 20 20 20 20 20 4e 6f 74 65 20 35 0a 23 |4.# Note 5.#| 00000090 20 20 20 20 20 46 6f 72 6d 75 6c 61 0a 23 20 20 | Formula.# | 000000a0 20 20 20 4e 6f 74 65 20 31 0a 23 20 20 20 20 20 | Note 1.# | 000000b0 41 6e 64 20 73 6f 20 6f 6e 2e 2e 2e 0a 23 20 54 |And so on....# T| 000000c0 6f 20 66 69 74 20 73 6e 75 67 6c 79 20 69 6e 74 |o fit snugly int| 000000d0 6f 20 74 68 65 20 77 69 6e 64 6f 77 2c 20 65 61 |o the window, ea| 000000e0 63 68 20 6c 69 6e 65 20 73 68 6f 75 6c 64 20 62 |ch line should b| 000000f0 65 20 6e 6f 20 6c 6f 6e 67 65 72 0a 23 20 74 68 |e no longer.# th| 00000100 61 6e 20 34 32 20 63 68 61 72 61 63 74 65 72 73 |an 42 characters| 00000110 2e 0a 23 20 54 68 65 72 65 20 69 73 20 61 20 6c |..# There is a l| 00000120 69 6d 69 74 20 6f 66 20 32 35 20 66 6f 72 6d 75 |imit of 25 formu| 00000130 6c 61 73 20 70 65 72 20 74 6f 70 69 63 2e 0a 0a |las per topic...| 00000140 23 20 41 6e 79 20 6e 6f 74 65 73 20 73 68 6f 75 |# Any notes shou| 00000150 6c 64 20 62 65 20 6d 61 64 65 20 68 65 72 65 2c |ld be made here,| 00000160 20 61 74 20 74 68 65 20 62 65 67 69 6e 6e 69 6e | at the beginnin| 00000170 67 20 61 6e 64 20 73 68 6f 75 6c 64 0a 23 20 62 |g and should.# b| 00000180 65 20 70 72 65 63 65 65 64 65 64 20 62 79 20 61 |e preceeded by a| 00000190 20 68 61 73 68 20 28 23 29 2e 0a 0a 56 3d 49 52 | hash (#)...V=IR| 000001a0 0a 57 68 65 72 65 3a 0a 56 3d 76 6f 6c 74 61 67 |.Where:.V=voltag| 000001b0 65 20 28 56 29 0a 49 3d 63 75 72 72 65 6e 74 20 |e (V).I=current | 000001c0 28 41 29 0a 52 3d 72 65 73 69 73 74 61 6e 63 65 |(A).R=resistance| 000001d0 20 28 4f 68 6d 73 29 0a 0a 49 3d 41 76 6e 51 0a | (Ohms)..I=AvnQ.| 000001e0 57 68 65 72 65 3a 0a 49 3d 63 75 72 72 65 6e 74 |Where:.I=current| 000001f0 2c 20 41 3d 61 72 65 61 0a 76 3d 76 65 6c 6f 63 |, A=area.v=veloc| 00000200 69 74 79 20 6f 66 20 63 68 61 72 67 65 64 20 63 |ity of charged c| 00000210 61 72 72 69 65 72 73 0a 6e 3d 63 68 61 72 67 65 |arriers.n=charge| 00000220 64 20 63 61 72 72 69 65 72 20 64 65 6e 73 69 74 |d carrier densit| 00000230 79 0a 51 3d 63 68 61 72 67 65 0a 52 3d 72 6c 2f |y.Q=charge.R=rl/| 00000240 41 0a 57 68 65 72 65 3a 0a 52 3d 72 65 73 69 73 |A.Where:.R=resis| 00000250 74 61 6e 63 65 20 28 4f 68 6d 73 29 0a 72 3d 72 |tance (Ohms).r=r| 00000260 65 73 69 73 74 69 76 69 74 79 20 66 6f 72 20 6d |esistivity for m| 00000270 61 74 65 72 69 61 6c 0a 6c 3d 6c 65 6e 67 74 68 |aterial.l=length| 00000280 20 6f 66 20 6d 61 74 65 72 69 61 6c 0a 41 3d 63 | of material.A=c| 00000290 72 6f 73 73 20 73 65 63 74 69 6f 6e 61 6c 20 61 |ross sectional a| 000002a0 72 65 61 20 6f 66 20 6d 61 74 65 72 69 61 6c 0a |rea of material.| 000002b0 52 3d 52 31 2b 52 32 2b 52 33 2e 2e 2e 0a 57 68 |R=R1+R2+R3....Wh| 000002c0 65 72 65 3a 0a 52 3d 74 6f 74 61 6c 20 72 65 73 |ere:.R=total res| 000002d0 69 73 74 61 6e 63 65 0a 52 31 2c 20 52 32 2c 20 |istance.R1, R2, | 000002e0 52 33 2e 2e 2e 20 61 72 65 20 72 65 73 69 73 74 |R3... are resist| 000002f0 6f 72 73 20 69 6e 20 73 65 72 69 65 73 0a 0a 0a |ors in series...| 00000300 31 2f 52 3d 28 31 2f 52 31 29 2b 28 31 2f 52 32 |1/R=(1/R1)+(1/R2| 00000310 29 2b 28 31 2f 52 33 29 2e 2e 2e 0a 57 68 65 72 |)+(1/R3)....Wher| 00000320 65 3a 0a 52 3d 74 6f 74 61 6c 20 72 65 73 69 73 |e:.R=total resis| 00000330 74 61 6e 63 65 0a 52 31 2c 20 52 32 2c 20 52 33 |tance.R1, R2, R3| 00000340 2e 2e 2e 20 61 72 65 20 72 65 73 69 73 74 6f 72 |... are resistor| 00000350 73 20 69 6e 20 70 61 72 61 6c 6c 65 6c 0a 0a 0a |s in parallel...| 00000360 51 3d 49 74 0a 57 68 65 72 65 3a 0a 51 3d 63 68 |Q=It.Where:.Q=ch| 00000370 61 72 67 65 20 28 43 29 0a 49 3d 63 75 72 72 65 |arge (C).I=curre| 00000380 6e 74 20 28 41 29 0a 74 3d 74 69 6d 65 20 28 73 |nt (A).t=time (s| 00000390 29 0a 0a 56 3d 45 2f 51 0a 57 68 65 72 65 3a 0a |)..V=E/Q.Where:.| 000003a0 56 3d 76 6f 6c 74 61 67 65 20 28 56 29 0a 45 3d |V=voltage (V).E=| 000003b0 65 6e 65 72 67 79 20 28 4a 29 0a 51 3d 63 68 61 |energy (J).Q=cha| 000003c0 72 67 65 20 28 43 29 0a 0a 45 3d 49 74 56 0a 57 |rge (C)..E=ItV.W| 000003d0 68 65 72 65 3a 0a 45 3d 65 6c 65 63 74 72 69 63 |here:.E=electric| 000003e0 61 6c 20 65 6e 65 72 67 79 20 28 4a 29 0a 49 3d |al energy (J).I=| 000003f0 63 75 72 72 65 6e 74 20 28 41 29 0a 74 3d 74 69 |current (A).t=ti| 00000400 6d 65 20 28 73 29 0a 56 3d 76 6f 6c 74 61 67 65 |me (s).V=voltage| 00000410 20 28 56 29 0a 50 3d 45 2f 74 0a 57 68 65 72 65 | (V).P=E/t.Where| 00000420 3a 0a 50 3d 70 6f 77 65 72 20 28 57 29 0a 45 3d |:.P=power (W).E=| 00000430 65 6e 65 72 67 79 20 28 4a 29 0a 74 3d 74 69 6d |energy (J).t=tim| 00000440 65 20 28 73 29 0a 0a 50 3d 56 49 0a 57 68 65 72 |e (s)..P=VI.Wher| 00000450 65 3a 0a 50 3d 70 6f 77 65 72 20 28 57 29 0a 56 |e:.P=power (W).V| 00000460 3d 76 6f 6c 74 61 67 65 20 28 56 29 0a 49 3d 63 |=voltage (V).I=c| 00000470 75 72 72 65 6e 74 20 28 41 29 0a 0a 43 3d 51 2f |urrent (A)..C=Q/| 00000480 56 0a 57 68 65 72 65 3a 0a 43 3d 63 61 70 61 63 |V.Where:.C=capac| 00000490 69 74 61 6e 63 65 20 6f 66 20 61 20 63 61 70 61 |itance of a capa| 000004a0 63 69 74 6f 72 20 28 46 29 0a 51 3d 63 68 61 72 |citor (F).Q=char| 000004b0 67 65 20 28 43 29 0a 56 3d 76 6f 6c 74 61 67 65 |ge (C).V=voltage| 000004c0 20 28 56 29 0a 0a 45 3d bd 51 56 0a 57 68 65 72 | (V)..E=.QV.Wher| 000004d0 65 3a 0a 45 3d 65 6e 65 72 67 79 20 73 74 6f 72 |e:.E=energy stor| 000004e0 65 64 20 69 6e 20 61 20 63 61 70 61 63 69 74 6f |ed in a capacito| 000004f0 72 20 28 4a 29 0a 51 3d 63 68 61 72 67 65 20 28 |r (J).Q=charge (| 00000500 43 29 0a 56 3d 76 6f 6c 74 61 67 65 20 28 56 29 |C).V=voltage (V)| 00000510 0a 0a 31 2f 43 3d 28 31 2f 43 31 29 2b 28 31 2f |..1/C=(1/C1)+(1/| 00000520 43 32 29 2b 28 31 2f 43 33 29 2e 2e 2e 0a 57 68 |C2)+(1/C3)....Wh| 00000530 65 72 65 3a 0a 43 3d 74 6f 74 61 6c 20 63 61 70 |ere:.C=total cap| 00000540 61 63 69 74 61 6e 63 65 20 28 46 29 0a 43 31 2c |acitance (F).C1,| 00000550 20 43 32 2c 20 43 33 2e 2e 2e 20 61 72 65 20 63 | C2, C3... are c| 00000560 61 70 61 63 69 74 6f 72 73 20 69 6e 20 73 65 72 |apacitors in ser| 00000570 69 65 73 0a 0a 0a 43 3d 43 31 2b 43 32 2b 43 33 |ies...C=C1+C2+C3| 00000580 2e 2e 2e 0a 57 68 65 72 65 3a 0a 43 3d 74 6f 74 |....Where:.C=tot| 00000590 61 6c 20 63 61 70 61 63 69 74 61 6e 63 65 20 28 |al capacitance (| 000005a0 46 29 0a 43 31 2c 20 43 32 2c 20 43 33 2e 2e 2e |F).C1, C2, C3...| 000005b0 20 61 72 65 20 63 61 70 61 63 69 74 6f 72 73 20 | are capacitors | 000005c0 69 6e 20 70 61 72 61 6c 6c 65 6c 0a 0a 0a 51 3d |in parallel...Q=| 000005d0 51 30 65 5e 28 2d 74 2f 52 43 29 0a 49 6e 20 74 |Q0e^(-t/RC).In t| 000005e0 68 65 20 64 69 73 63 68 61 72 67 65 20 6f 66 20 |he discharge of | 000005f0 61 20 63 61 70 61 63 69 74 6f 72 3a 0a 51 3d 63 |a capacitor:.Q=c| 00000600 68 61 72 67 65 20 28 43 29 0a 51 30 3d 69 6e 69 |harge (C).Q0=ini| 00000610 74 69 61 6c 20 63 68 61 72 67 65 0a 74 3d 74 69 |tial charge.t=ti| 00000620 6d 65 20 28 73 29 2c 20 65 3d 32 2e 37 31 38 2e |me (s), e=2.718.| 00000630 2e 2e 0a 52 43 3d 72 65 73 69 73 74 61 6e 63 65 |...RC=resistance| 00000640 d7 63 61 70 61 63 69 74 61 6e 63 65 3d 74 69 6d |.capacitance=tim| 00000650 65 20 63 6f 6e 73 74 61 6e 74 0a 43 3d 65 30 65 |e constant.C=e0e| 00000660 72 41 2f 64 0a 46 6f 72 20 61 20 70 61 72 61 6c |rA/d.For a paral| 00000670 6c 65 6c 20 70 6c 61 74 65 20 63 61 70 61 63 69 |lel plate capaci| 00000680 74 6f 72 3a 0a 43 3d 63 61 70 61 63 69 74 61 6e |tor:.C=capacitan| 00000690 63 65 20 28 46 29 0a 65 30 3d 70 65 72 6d 69 74 |ce (F).e0=permit| 000006a0 74 69 76 69 74 79 20 6f 66 20 66 72 65 65 20 73 |tivity of free s| 000006b0 70 61 63 65 0a 65 72 3d 72 65 6c 61 74 69 76 65 |pace.er=relative| 000006c0 20 70 65 72 6d 69 74 74 69 76 69 74 79 0a 41 3d | permittivity.A=| 000006d0 70 6c 61 74 65 20 61 72 65 61 2c 20 64 3d 64 69 |plate area, d=di| 000006e0 73 74 61 6e 63 65 20 62 65 74 77 65 65 6e 20 70 |stance between p| 000006f0 6c 61 74 65 73 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a |lates...........| 00000700 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a |................| * 00000720 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a 0a |............| 0000072c
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