3 Energy and Voltage Flashcards by Mr Saunders-Reid

Q

Unit of current is …..

A

amps

A

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Q

Current is the …

A

rate of flow of charge

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Q

Unit of energy is …..

A

joules

J

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Q

energy transferred E =

A

E = IVt

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Q

Unit of voltage is …..

A

Volts

V

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Q

Voltage =

(the equation with energy in)

A

voltage = energy / charge

V = E/Q

1 volt = 1 joule / coulomb

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Q

Voltage V =

(the equation with R in)

A

V=IR

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Q

What is resistance?

A

oppostion to flow of charge.

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Q

Power P =

A

Power = energy / time

or

P=IV

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Q

Unit of power is…

A

Watts (W)

1 W = 1 J/second

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Q

What type of circuit is this? Series or parallel?

A

Series circuit

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Q

What component symbol is shown below?

A

variable resistor

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Q

What component symbol is shown below?

A

thermistor

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Q

What component symbol is shown below?

A

ammeter

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Q

What component symbol is shown below?

A

diode

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Q

What component symbol is shown below?

A

buzzer

Q

What component symbol is shown below?

A

motor

Q

What component symbol is shown below?

A

voltmeter

Q

What component symbol is shown below?

A

bulb

Q

What component symbol is shown below?

A

Fuse

Q

What component symbol is shown below?

A

Light emitting diode

Q

What component symbol is shown below?

A

Light dependent resistor

Q

What can you say about the current in a series circuit and the current in a parallel circuit?

A

Series - current is the same everywhere

Parallel - current splits between the branches

current into a junction = current out of a junction

Q

Each cell provides 3 V

In which circuit (series or parallel) are the bulbs brighter?

A

Parallel bulbs are brighter

Series- voltage is shared - V_Cell= V₁ + V₂

Parallel - each bulb gets the full voltage of the cell - V_cell = V₁ = V₂

Why are the bulbs dimmer in the second circuit?

Voltage is shared between bulbs in series Less voltage across cell therefore bulb is dimmer.

Explain why the second circuit draws a lower current from the cell?

circuit with two bulbs in series has larger resistance so current decreases for same voltage

What is true about the current in a series circuit?

Current is the same everywhere in a series circuit

How does the resistance of an LDR vary with light intensity?

As light intensity increases, resistance decreases

How does the resistance of an thermistor vary with temperature?

As temp increases, resistance of thermistor decreases

What can you say about the voltage in a series circuit and the voltage in a parallel circuit?

Parallel - voltage is the same across each branch Series - voltage splits total voltage = sum of all voltages across components