Preformed vitamin A occurs naturally in dairy products, eggs, fish and meat, especially liver. Carotenoids are found in bright yellow and orange vegetables such as carrots, pumpkin and sweet potatoes, broccoli and spinach.he best food sources are beef and chicken liver, whole milk, cheese, and eggs. You get vitamin A from beta-carotene in carrots, mango, sweet potato, spinach, cantaloupe, kale, apricots, red pepper, broccoli, and fortified foods.
When the switch is first closed, the voltage across the capacitor (which we were told was fully discharged) is zero volts; thus, it first behaves as though it were a short-circuit. Over time, the capacitor voltage will rise to equal battery voltage, ending in a condition where the capacitor behaves as an open-circuit.
Current Across the Resistor-Initially I max =Îµ/Rt (sec)Since the voltage drop across the resistor decreases as the capacitor charges, the current across the resistor will reach ZERO after a very long time. Note: This is while the capacitor is CHARGING. Voltage Across the Capacitor-Initially V cap Îµt (sec)As the capacitor charges it eventually reaches the same voltage as the battery or the EMF in this case after a very long time. This increase DOES NOT happen linearly.