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Transcript
Electric Circuits Chapter 1, Section 3 Voltage and Resistance • Current in a circuit increases as the voltage increases • Current in a circuit decreases as the resistance increases Ohm’s Law • The relationship between voltage, current, and resistance • Current = voltage/resistance • I = V/R • (A) = (V)/(Ω) Circuits • Series Circuit - has only 1 path for electric current to follow – If the path is broken at any point, the current will not flow and the circuit will stop working – The same current flows through all devices connected to a series circuit but the resistance increases with each device Circuits • Parallel Circuit – a circuit that has more than one path for the electric current to flow through – current flows through every path, so if one pathway is broken, it may not affect the others – The current in each path can be different depending on the devices connected to the circuit on that path Protecting Electric Circuits • Circuits are “broken” when the current becomes larger than 15A or 20A • Fuses and Circuit Breakers Electric Power • Electric power – the rate at which electric energy is turned into another form of energy • Measured in watts (W) • Power = Current x Voltage • P=IxV • (W) = (A) x (V) Electrical Safety • Table 2 on pg 25 – KNOW IT!! • Current as low as .5A (the current needed to power a 60W light bulb) can be deadly to the body Lightning Safety • Take shelter if you can see lightning or hear thunder • Avoid high places, open fields, metal surfaces, water, and isolated high objects • Lightning safety position – Squat low on the balls of your feet with your hands on your knees
