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- Created by: Sevdeg
- Created on: 11-05-14 12:24
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- Electric current, potential difference and resistance
- Conventional current is from positive to negative. But electrons in the metal wire move from negative to positive.
- Current (A): Charge (C)/ Time (t)
- Voltmeter placed across the power supply measures the emf of the supply, whereas the voltmeters placed across resistors measure the P.D.
- P.D: Work done per unit charge. When charges lose energy by transferring electrical energy to other forms.
- E.M.F: Energy converted from chemical to electrical when charge flows through cell.
- * Greater PD, greater current
- *Greater resistance, smaller current
- The ohm is the resistance of a component when a PD of 1 volt drives a current of 1 A through it.
- To determine the R of a material we connect the voltmeter parallel to the material.
- Power= Energy transferred/ time
- Energy= Voltage*Charge
- Power=VI Power=I^2R Power=V^2/R
- Energy=IVt
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