Electricity & D.C Circuits Flashcards

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1
Q

Ohm

A

Volt/ Ampere

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2
Q

Equal voltage Cells connected in parallel with positives together. What happens to original voltage of the first cell ?
Does this affect resistors in the circuit?

A

-T is halved.
-no change

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3
Q

Define volt

A

Volt = Joule / Coulomb

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4
Q

Two lamps P and Q connected in parallel. This combination is connected in series with a resistor R and power supply of 4.5 V. I-V graph given.
1. Find current in battery.
2. Calculate the resistance of resistor R.
3. The filament wire of lamp Q breaks and stops conducting. State and explain, qualitatively, the effect on the resistance of lamp P.

A
  1. I = I(p) + I (q) {from graph}
  2. V = IR
    R = V across R/ I
    = ( Emf - (p.d across lamps) ) / I from part 1.
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