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A string of 20 Christmas tree lights are connected in series to a 20 volt power source The bulbs each have a resistance of 1/2 ohm How much current is flowing through the circuit?
Wiki User
∙ 13y ago
I = V/R
V= 20 volts
R = Total resistance = 10 * 0.5 = 10 ohms
I = 2 amps
Wiki User
∙ 13y ago
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When wires are connected to the terminals of a battery. what causes electric current in the circuit?
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The resistance of the load is what causes an electric current to flow in a circuit.
When an ammeter is connected to measure current circuit current will decrease sightly because R total decreases after the meter is inserted?
Current will be decreased because of the resistance of the ammeter added to the circuit's resistance. In other words total resistance increases.
What is the relationship between resistance and current in a resistive circuit?
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Why would never measure resistance in a circuit carrying a current?
If the circuit is carrying current then that means that the load (resistance) is in the circuit. if an ohm meter is connected in the live circuit then there would be some voltage drop at the ohm meter but as the meter has very less resistance, this would damage the instrument.
Why does copper have a low resistance?
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