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"metadata": {},
"source": [
"# Chapter 20: Alternating Currents and Electronics"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex20.1:pg-982"
]
},
{
"cell_type": "code",
"execution_count": 4,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"We have to wait for a time of t= 10.0 sec\n"
]
}
],
"source": [
" #Example 20_1\n",
"import math \n",
"#To findout the time that it has to wait after turning off the set before it is safe to touch capacitor\n",
"r=10.0**6 #Units in Ohms\n",
"c=10.0**-5 #Units in F\n",
"ti=r*c #Units in Sec\n",
"print \"We have to wait for a time of t=\",round(ti),\" sec\"\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex20.2:pg-983"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The RMS current when f=20 Hz is= 0.00402 Ohms\n",
"The RMS current when f=2*10**6 Hz is= 402.12 Ohms\n"
]
}
],
"source": [
" #Example 20_2\n",
"\n",
"import math\n",
" \n",
"#To find the rms current in the circuit \n",
"f=20 #Units in Hz\n",
"c=4*10.0**-7 #Units in F\n",
"xc=1/(2.0*math.pi*f*c) #Units in Ohms/sec\n",
"f=2*10**6 #Units in Hz\n",
"xc1=1/(2*math.pi*f*c) #Units in Ohms/sec\n",
"v=80.0 #Units in V\n",
"i=v/xc #Units in A\n",
"i1=v/xc1 #Units in A\n",
"print \"The RMS current when f=20 Hz is=\",round(i,5),\" Ohms\\nThe RMS current when f=2*10**6 Hz is=\",round(i1,2),\" Ohms\"\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex20.3:pg-984"
]
},
{
"cell_type": "code",
"execution_count": 5,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The current in the inductor when frequency=60 Hz is I= 7.07 A\n",
"\n",
"The current in the inductor when frequency=6*10**2 Hz is I= 0.000707 A\n"
]
}
],
"source": [
" #Example 20_3\n",
"import math \n",
" \n",
"#To find the current through the inductor\n",
"f=60 #Units in Hz\n",
"l=15.0*10**-3 #Units in H\n",
"xl=2*math.pi*f*l #Units in Ohms\n",
"v=40 #Units in V\n",
"i=v/xl #Units in A\n",
"print \"The current in the inductor when frequency=60 Hz is I=\",round(i,2),\" A\"\n",
"f=6.0*10**5 #Units in Hz\n",
"l=15.0*10**-3 #Units in H\n",
"xl=2*math.pi*f*l #Units in Ohms\n",
"v=40 #Units in V\n",
"i=v/xl #Units in A\n",
"print \"\\nThe current in the inductor when frequency=6*10**2 Hz is I=\",round(i,6),\" A\"\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex20.4:pg-984"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The current in circuit is I= 0.2439 A\n",
"Volt meter readings across resistor Vr= 73.2 V\n",
"Readings across capacitor is Vc= 32.3 V\n",
"Power loss in circuit is= 17.8 W\n"
]
}
],
"source": [
" #Example 20_4\n",
"import math \n",
" \n",
"#To find current in circuit, Voltmeter reading, reading across capacitor and power loss\n",
"f=2000 #Units in Hz\n",
"c=0.6*10**-6 #Units in F\n",
"xc=1/(2*math.pi*f*c) #Units in Ohms\n",
"r=300 #Units in Ohms\n",
"z=math.sqrt(r**2+xc**2) #Units in Ohms\n",
"v=80 #Units in V\n",
"i=v/z #Units in A\n",
"vr=i*r #Units in V\n",
"vc=i*xc #Units in V\n",
"p=i**2*r #Units in W\n",
"print \"The current in circuit is I=\",round(i,4),\" A\\nVolt meter readings across resistor Vr=\",round(vr,1),\" V\\nReadings across capacitor is Vc=\",round(vc,1),\" V\\nPower loss in circuit is=\",round(p,1),\" W\"\n"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Ex20.5:pg-984"
]
},
{
"cell_type": "code",
"execution_count": 3,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"The current in circuit is I= 2.17 A\n",
"Volt meter reading across R Vr= 43.4 V\n",
"Volt meter reading across L Vl= 32.7 V\n",
"Volt meter reading across c Vc= 57.6 V\n",
"\n"
]
}
],
"source": [
" #Example 20_5\n",
"\n",
"import math \n",
"#To find the current in circuit and voltmeters reading across R C and L\n",
"f=600 #Units in Hz\n",
"l=4.0*10**-3 #Units in H\n",
"xl=2*math.pi*f*l #Units in Ohms\n",
"c=10.0*10**-6 #Units in F\n",
"xc=1/(2*math.pi*f*c) #Units in Ohms\n",
"r=20.0 #Units in Ohms\n",
"z=math.sqrt(r**2+(xl-xc)**2) #Units in Ohms\n",
"v=50.0 #Units in V\n",
"i=v/z #Units in A\n",
"vr=i*r #Units in V\n",
"vl=i*xl #Units in V\n",
"vc=i*xc #Units in V\n",
"print \"The current in circuit is I=\",round(i,2),\" A\\nVolt meter reading across R Vr=\",round(vr,1),\" V\\nVolt meter reading across L Vl=\",round(vl,1),\" V\\nVolt meter reading across c Vc=\",round(vc,1),\" V\\n\"\n"
]
}
],
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