Resistors in parallel3/7/2023 Thus, for the two lightbulbs in series, the one with the higher resistance (lower wattage) will be brighter, and for a parallel configuration the one with the lower resistance (higher wattage) will be brighter. Resistors In Parallel - The Easy Way 34 related questions found. Each resistor thus has the full voltage of the source applied to it. Whereas in a parallel they share the same voltage. Resistors are in parallel when each resistor is connected directly to the voltage source by connecting wires having negligible resistance. In a series connection, they share the same current. Thus, there is an inverse relationship between the resistance of the lightbulb and the power rating. First we have to find out how the resistances of light bulb correlate to the power rating. Which one will be brighter? What if they are connected in parallel? (3 marks)Īns. Two lightbulbs, one graded at 40W and one graded at 60W are connected in series to a battery. There is only one resistor (R2) in the path of the new voltage, so we can calculate what that voltage needs to be to deliver the new current: Now that we have the current, we can calculate the additional current that the new voltage contributes: Then, we can use Ohm's law to calculate the current through the circuit: Since the two resistors are in series, we can simply add them. We will need to calculate the total equivalent resistance of the circuit. What is the value of this voltage if the current through R2 is 4A? (5 marks)Īns. First, we need to calculate the current flow through R2 without the extra voltage attached. A voltage is applied across points A and B so that current flows from A, to R2, to B. Now, to get the total equivalent resistance, we can simply add the two remaining values, since they are in series: The resistors are connected in parallel, and the potential (voltage) across each resistor is the same. Therefore the total resistance is given by, The voltage drops across all resistors in a parallel resistive network, on the other hand, is constant. In each resistor the flow of current depends on the value. Calculate the equivalent resistance in the following circuit and also find the current I, I1 and I2 in the given circuit. RESISTORS IN PARALLEL CHARACTERSTICs There are same voltages across each resistor in parallel ckt. Since the resistors are connected in series, the total resistance in the circuit is given by,Ĭurrent I in the circuit= V/ Req = 24/10 = 2. Calculate the equivalent resistance for the circuit which is connected to 24 V battery and also find the potential difference across 4 Ω and 6 Ω resistors in the circuit. The resistance of a parallel circuit is less than the resistance of individual resistors because the total resistance of resistors connected in parallel is equal to the reciprocal of the sum of the total resistance. Why is the resistance of a parallel circuit less than the resistance of individual resistors? (2 marks)Īns. A battery is a series of cells that are connected in series. How are batteries connected? (2 marks)Īns. Resistors in Series and Parallel Important Questions
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