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Physics > ELECTRICITY FORMULAS > Flashcards

ELECTRICITY FORMULAS Flashcards

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1
Q

State the formula for potential difference

A

pd = current x resistance

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2
Q

state the formula for resistance

A

resistance = pd/current

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3
Q

state the formula for current

A

current = pd / resistance

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4
Q

state the formula for charge

A

charge = current x time

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5
Q

state the formula for power transferred

A

power transferred = pd x current

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6
Q

state the formula for power absorbed

A

current squared x resistance

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7
Q

state the formula for energy transferred

A

power x time

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8
Q

what can you calculate using this formula

i x t

A

charge

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9
Q

what can you calculate using this formula

Q/t

A

current

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10
Q

a series circuit has a cell of 30V, a resistor of 6 ohms and a resistor of 4 ohms. What is the current flowing in the circuit?

A

current = pd / resistance

6+4=10
30 / 10 = 3A

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11
Q

what can you work out using this formula?

P x T

A

energy transferred

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12
Q

what can you calculate using this formula

V/i

A

resistance

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13
Q

what can you calculate using this formula

i x V

A

power transferred

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14
Q

what can you calculate using this formula?

i2 x R

A

power dissipated

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15
Q

how do you calculate voltage

A

current x resistance

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16
Q

state the formula for potential difference

A

V=IR

current x resistance

17
Q

using ohms law, how do you calculate current in a circuit?

A

potential difference / resistance

18
Q

how do you find the current that flows through each resistor in parallel?

A

divide current of cell (eg 20) by each resistor value (eg resistor 1 has value of 2 ohms, 20 / 2 = 10A)

Physics (2 decks)

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