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Physics > Section B Electricity > Flashcards

Section B Electricity Flashcards

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1
Q

In which type of circuit is current conserved?

A

Parallel circuits.

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2
Q

What type of current flows from batteries?

A

DC currents. They flow from solar cells and batteries.

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3
Q

What type of current flows from electricity mains?

A

AC currents.

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4
Q

What does AC stand for?

A

Alternating current.

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5
Q

What does DC stand for?

A

Direct current.

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6
Q

What is power measured in?

A

Watts.

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7
Q

What is current measured in?

A

Amperes (amps)

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8
Q

What is insulation?

A

When the conducting part of the wire is covered (protected) with plastics (PVC) and so they become safe.

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9
Q

What is the current in a circuit?

A

The rate of flow of charge round the circuit.

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10
Q

What is voltage?

A

The driving force that pushes the current round the circuit.

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11
Q

What is the resistance?

A

Anything in the circuit which slows the flow down.

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12
Q

What is the unit for resistance?

A

Ohms (omegle sign)

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13
Q

What is the equation linking electrical power, current and voltage?

A

Electrical power = current x voltage

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14
Q

What is double insulation?

A

Prevents electrocution by using an outer casing made up of plastics with appliances such as refrigerators, toasters and kitchen appliances.

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15
Q

What does an ammeter do in a test circuit?

A

Measures the current. ONLY in series. Never in parallel.

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16
Q

What is a voltmeter?

A

Measures the voltage (in volts). Are always connected in parallel with a component, even in a series circuit.

17
Q

How do you calculate the energy transferred by an appliance?

A

Energy transferred = current x voltage x time

18
Q

What is the equation for measuring voltage?

A

Voltage = Current x Resistance

19
Q

Where must an ammeter be placed in a circuit?

A

Anywhere in the main circuit, but never in parallel.

20
Q

What are circuit breakers?

A

They break the circuit when they detect a surge in the current. They break the circuit by opening a switch.

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