Electronic flash
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The electronic flash on a camera uses a capacitor to store electrical energy from a battery. This energy is then dumped into a flash tube to produce light for photography. The amount of energy needed for the flash depends on the light power output and duration of the flash. Not all electrical energy is converted to light - some becomes thermal energy. Capacitors recharge between flashes using resistors, and the resistance can be calculated from the capacitor's capacitance and recharge time constant.
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Electricity, without notes, without answers
This document discusses basic electrical concepts including circuits, current, voltage, resistance, and power. It defines current as the flow of electric charge measured in amperes. Voltage or electric potential difference (PD) is the amount of energy given to each coulomb of charge and is measured in volts. Resistance is a material's ability to prevent electron flow and is calculated using Ohm's Law. Circuits can be connected in series or parallel, and power is calculated as voltage times current, measured in watts. Examples of calculations using these concepts are also provided.
Electricity fundamentals
Electricity is the flow of electric charge. It is created by an imbalance of electric charges between objects. There are three main properties of electricity: current, which is the flow of electrons; voltage, which is the difference in electric potential; and resistance, which prevents the flow of electrons. Ohm's law states that voltage equals current times resistance. Electricity is generated by moving a coil of wire through a magnetic field or vice versa, inducing a current. It is transmitted at high voltages to reduce energy loss, then transformed to lower voltages for consumer use.
Electricity by VonnySidharta
Static electricity is caused by an imbalance of electrons between two objects. Rubbing certain materials together, like fur and ebonite, can cause this imbalance as electrons are transferred. Conductors allow electrons to flow freely, while insulators impede electron flow. Static electricity has many uses, like in photocopiers, but can also be dangerous in situations like lightning or refueling. Electric current is the flow of electrons through a material over time. Resistance opposes this flow. Circuits use components like resistors, capacitors, and switches to control current. Electricity powers many appliances and lights in homes. Safety devices like fuses and circuit breakers help prevent overloads.
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Electronic flash
- 1. Physics Presentation: Electronic Flash Group 10: MIRAFLORES, Trixie DATOC, Hillary
- 2. Electronic Flash — The electronic flash on a camera uses a capacitor. A battery charges up the electronic flash capacitor for a short time ( t) until it reaches the required energy for a flash. The capacitor dumps this full charge/energy (Uflash) into the flash tube in order to produce an average light power output (Pave). — This equation gives us the required energy for a flash: — — Uflash = Pave * t
- 3. Electronic Flash — This amount of energy is related to the energy stored in a capacitor. Not all electrical energy in a capacitor can be converted to light. The rest of the converted product is made up of thermal energy. Every conversion of electrical energy to light has its own output. The relation between the electrical energy and the light power output is: — — Uflash = (e/ 100) * Ucapacitor , where e = percent efficiency in producing light power output, Uflash = light power output, Ucapacitor = electrical energy stored in the capacitor
- 4. Electronic Flash — Capacitors used by electronic flashes usually recharge after every flash by using resistors. The value of resistance can be measured using the equation: — — R = T/C, where R = resistance, T = time constant (time between every capacitor recharge), C = capacitance. The unit of R is ohm.
- 6. Examples — 1. A camera can produce a flash with an average light power output of 54.7 watts. If it requires 48.1 J to produce a flash, how long will it take to reach the required amount of energy? — — Uflash = Pave * t — — 48.1 = 54.7 ( t) — — t = 0.879 s
- 7. Examples — 2. A capacitor used by an electric flash recharges after every 1.2 seconds. Given that its resistor has a value of 5335 ohms, what is its capacitance? — — R = T/C — — 5335 ohms = 1.2 s /C — — C = 6402 F
- 8. Examples — 3. An electronic flash attachment for a camera has a light power output of 250 watts. If the camera has a percent efficiency of 93%, how much electrical energy is stored in its capacitor? — — Uflash = (e/ 100) * Ucapacitor — — 250 watts = (93/100) * Ucapacitor — — Ucapacitor = 268.8