Capacitors 0.0 / 5 PhysicsCapacitorsA2/A-levelOCR Created by: louderthanbombzCreated on: 06-01-18 18:17 What's the formula for capacitance? Capacitance C=Q/V 1 of 13 If 150C flows through a circuit, what charge is on the plates? If 150C flows, 150C is on the positive plate and -150C is on the negative plate. 2 of 13 What are electrolytic capacitors? Electrolytic capacitors increase capacitance with more charge on the positive plate. They can blow up. 3 of 13 What are supercapacitors? Supercapacitors are used for electronics and store charge. They charge in seconds and have less resistance. 4 of 13 What's the formula for rate of change of charge? dQ/dt=-Q/RC where R and C are constant. Change in charge is proportional to charge remaining. 5 of 13 What are uses of capacitors? Capacitors are used for cameras, car radio, defibrillators, and charging mobile devices. 6 of 13 What's the formula for energy? E=1/2 QV 7 of 13 What's the formula for capacitance? C = Eo * A/d 8 of 13 How does capacitance add in series and parallel? In parallel capacitance adds, in series it adds as resistors do in parallel. 9 of 13 How do you charge a capacitor? When charging a capacitor, close the switch and record PD regularly. 10 of 13 What's the formula for discharging a resistor? For a V-t graph, discharge of a resistor is exponential as charging for a capacitor would be. V=Voe^-t/T where T=RC 11 of 13 What's the effect of greater resistance on capacitor discharge? Greater resistance increases the time for discharge. 12 of 13 How do charges move in a capacitor? Charges flow to the negative and do work against repulsion before passing through the plates when the switch is open. 13 of 13

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