https://peda.net/id/13dc0a22e5a 2019-10-03T10:19:03+03:00 https://peda.net/:static/535/peda.net.logo.bg.svg <div class="license">Tämän sivun lisenssi <a rel="license" href="https://peda.net/info">Peda.net-yleislisenssi</a></div> https://peda.net/id/a035142ee5b 2019-10-03T11:34:22+03:00 7-2<br/> a) 19V, 2,1A<br/> b) 40W<br/> c) <br/> <img src="https://math-demo.abitti.fi/math.svg?latex=E%3DPt%3D40W%5Ccdot200%5Ccdot4h%3D32kWh" alt="E=Pt=40W\cdot200\cdot4h=32kWh"/><br/> <div><img src="https://math-demo.abitti.fi/math.svg?latex=32kWh%5Ccdot14%5C%20%5Cfrac%7Bsnt%7D%7BkWh%7D%3D4%7B%2C%7D48%E2%82%AC" alt="32kWh\cdot14\ \frac{snt}{kWh}=4{,}48€"/></div> <div> </div> <br/> 7-3<br/> a) <br/> b) <br/> c) <br/> <br/> 7-4<br/> P=RI^2<br/> U=RI<br/> lamppu a<br/> <img src="https://math-demo.abitti.fi/math.svg?latex=I%3D%5Cfrac%7BU%7D%7BR%7D%3D%5Cfrac%7B4%7B%2C%7D5%7D%7B4%7D%3D1%7B%2C%7D125A" alt="I=\frac{U}{R}=\frac{4{,}5}{4}=1{,}125A"/><br/> <img src="https://math-demo.abitti.fi/math.svg?latex=P%3D4%5Ccdot1%7B%2C%7D125%5E2%3D5%7B%2C%7D0625W" alt="P=4\cdot1{,}125^2=5{,}0625W"/> <br/> lamppu b<br/> <img src="https://math-demo.abitti.fi/math.svg?latex=I%3D%5Cfrac%7BU%7D%7BR%7D%3D%5Cfrac%7B4%7B%2C%7D5V%7D%7B6%7B%2C%7D0%5COmega%7D%3D0%7B%2C%7D75A" alt="I=\frac{U}{R}=\frac{4{,}5V}{6{,}0\Omega}=0{,}75A"/><br/> <img src="https://math-demo.abitti.fi/math.svg?latex=P%3D6%5Ccdot0%7B%2C%7D75%5E2%3D3%7B%2C%7D375W" alt="P=6\cdot0{,}75^2=3{,}375W"/><br/> lamppu c<br/> <img src="https://math-demo.abitti.fi/math.svg?latex=I%3D%5Cfrac%7BU%7D%7BR%7D%3D%5Cfrac%7B9%7B%2C%7D0V%7D%7B1%7B%2C%7D5%5COmega%7D%3D6A" alt="I=\frac{U}{R}=\frac{9{,}0V}{1{,}5\Omega}=6A"/><br/> <img src="https://math-demo.abitti.fi/math.svg?latex=P%3DRI%5E2%3D1%7B%2C%7D5%5COmega%5Ccdot6A%3D9W" alt="P=RI^2=1{,}5\Omega\cdot6A=9W"/><br/> lamppu d<br/> <img src="https://math-demo.abitti.fi/math.svg?latex=I%3D%5Cfrac%7BU%7D%7BR%7D%3D%5Cfrac%7B9%7B%2C%7D0V%7D%7B7%5COmega%7D%3D1%7B%2C%7D2857...A" alt="I=\frac{U}{R}=\frac{9{,}0V}{7\Omega}=1{,}2857...A"/><br/> <img src="https://math-demo.abitti.fi/math.svg?latex=P%3DRI%5E2%3D7%5Ccdot%20I%5E2%3D11%7B%2C%7D5714...W" alt="P=RI^2=7\cdot I^2=11{,}5714...W"/><br/> lamppu d on kirkkain<br/> <br/> 7-6<br/> <img src="https://math-demo.abitti.fi/math.svg?latex=21h%5Ccdot1%7B%2C%7D5W%5Ccdot365%3D11497%7B%2C%7D5Wh%3D11%7B%2C%7D4975kWh" alt="21h\cdot1{,}5W\cdot365=11497{,}5Wh=11{,}4975kWh"/><br/> <img src="https://math-demo.abitti.fi/math.svg?latex=11%7B%2C%7D4975%5Ccdot0%7B%2C%7D14%5C%20%5Cfrac%7B%E2%82%AC%7D%7BkWh%7D%3D1%7B%2C%7D60965%5Capprox1%7B%2C%7D61%E2%82%AC" alt="11{,}4975\cdot0{,}14\ \frac{€}{kWh}=1{,}60965\approx1{,}61€"/><br/> 7-7 2019-10-03T10:51:36+03:00