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A 9.0 volt battery connected to bulb. if a current of 0.25 Amps flows through bulb what is the resistance of bulb?
Wiki User
∙ 13y ago
V = IR
Voltage = Current * Resistance
so
9 = 0.25 * R
Hence R =36 Ohms
Wiki User
∙ 13y ago
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Why do batteries get warm?
Because they have internal resistance. Current flow through this internal resistance produces heat, just like current flow through ordinary resistors does. The current can be from use of the battery or charging the battery (if it is rechargeable). Usually the internal resistance of a battery increases with age, meaning older batteries tend to run hotter than fresh ones.
A copper wire was left connected from one terminal of a battery to the other The wire became very hot Why did the wire get so hot?
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A copper wire was left connected from one terminal of a battery to the other The wire became very hot Why did the wire get so hot?
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