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physics > P4- Electric Circuits > Flashcards

P4- Electric Circuits Flashcards

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1
Q

What is the force between two charged objects?

A

Non-contact force

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2
Q

What is the equation for charge flow?

A

Q = i x t

Charge flow (c) = current (a) x Time (s)

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3
Q

What does a circuit diagram show?

A

How components are connected together

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4
Q

What does a battery consist of

A

Two or more cells connected together

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5
Q

What is the size of an electric current?

A

The rate of flow charge

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6
Q

What is the equation of potential difference for resistance?

A

V = IR

P.d. Volts (v). Current (A) resistance ohms

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7
Q

What is the equation for potential difference across a component?

A

Potential difference across a component,

V volts v = energy transferred, E (joules, j)/ charge Q (coulombs, C)

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8
Q

What is the equation for the resistance of an appliance?

A

Resistance, R (ohms) = potential difference,V volts / current l amperes A

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9
Q

A filament lamps resistance increases if the …

A

Filaments temperature increases

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10
Q

In a diode how high and low is the forward and reverse resistance

A

Forward low

Reverse high

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11
Q

What happens to a thermistors resistance if it’s temperature increases

A

It decreases

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12
Q

What happens to the LDR’s resistance if the light intensity in it increases

A

Decreases

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13
Q

What is an electric current? And the unit?

A

A flow of electric charge around a circuit

Ampere (A) can be shortened to amp

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14
Q

How do you measure the current in a circuit

A

By using an ammeter

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15
Q

How do you measure potential difference?

A

Using a voltmeter

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16
Q

What is potential difference

A

A potential difference of 1 volt means that 1 joule of energy is transferred for each coulomb to f charge moving through the circuit

17
Q

What is the total resistance of two resistors in parallel less than

A

The resistance of the smallest individual resistor

18
Q

What do step up and step down transformers do?

A

Step up transformers increase the potential difference. This reduces energy loss in the transmission cables.

Step down transformers reduce the potential difference before the electricity to passes to homes

19
Q

What are sockets and plug cases made of?

A

Stiff plastic materials that enclose the electrical connections. Plastic is used because it is a good electrical insulator.

20
Q

What is the equation for power in terms of energy transferred?

A

Power P (watts, W) = energy transferred, E (joules, J) / time, t seconds, s

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