How many cells, each one having an open circuit emf of 4.5 V and an internal resistance of 0.5 ohms, are needed to supply current of 1.421 A to a resistor of 3 ohms if the cells are connected in parallel?
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A: Given: EMF of cell, E = 10 V internal resistance, r = 3 ohm current, i = 0.5 A
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A: Given data: Voltage (V) = 24 V Resistance (R) = 6 Ω Required: Current (I)
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Q: In a 1500-W hairdryer when it is plugged in to 120 V calculate the resistance of the hairdryer.
A: Given values: Power P = 1500 W Potential difference V = 120 V
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