2ENA Chapter 13 Electrical Systems Part III

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8th - 9th Grade

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1 Slide • 31 Questions

2ENA Chapter 13 Electrical Systems Part III

Multiple Choice

The diagram above represents an electric circuit consisting of four resistors and a 12-volt battery.

What is the current measured by ammeter A shown in the diagram?

4.0 A

72 A

2.0 A

0.50 A

Multiple Choice

The diagram above represents a circuit consisting of two resistors connected to a source of potential difference.

What is the current through the 20.-ohm resistor?

12 A

6.0 A

4.0 A

0.25 A

Multiple Choice

The total resistance of this circuit is

25.7 ohms

315 ohms

324 ohms

90 ohms

Multiple Choice

The total current going through the battery of this circuit is

0.35 amps

0.0286 amps

0 amps

9 amps

Multiple Choice

The total current through this circuit is

0.02 amps

0.09 amps

50 amps

9 amps

Multiple Choice

The total resistance in this circuit is

100 ohms

450 ohms

400 ohms

30 ohms

Multiple Choice

The total resistance of this circuit is

25.7 ohms

315 ohms

324 ohms

90 ohms

Multiple Choice

What resistance is needed to cause a 50A current flow because of a 500V battery?

10Ώ

5Ώ

2500Ώ

550Ώ

Multiple Choice

What voltage is needed to cause a 2A current flow through a 10Ω resistor?

0.2V

20V

200V

Multiple Choice

Voltage divided by Resistance

(V / R)

Current

Power

Ohms

Watts

Multiple Choice

Current times Resistance equals
(I X R)

Power

Voltage

Amperage

Ohm

Multiple Choice

What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?

25 V

10 V

2.5 V

0.4 V

Multiple Choice

What is Resistance?

The flow of electrons

Electric potential difference

A battery

The ability to reduce the flow of electrons

Multiple Choice

What is resistance measured in?

Ω (Ohms)

V (Volts)

A (Amps)

W (Watts)

Multiple Choice

What size resistor would produce a 3 Amp current flow with a 12 Volt battery

1 Ohm

3 Ohms

4 Ohms

12 Ohms

Multiple Choice

The diagram shows a _____.

circuit breaker

fuse

rheostat

switch

Multiple Choice

There is a damaged insulation.

The best thing to do is to _____.

cover the part with tape

call an electrician to replace

add a fuse

add an earth wire

Multiple Choice

This diagram shows _____.

a circuit breaker

overloading of a socket

a melting fuse

an electrocution hazard

Multiple Choice

The S.I. unit for Power is _____.

watt

joule

ampere

volt

Multiple Choice

The _____ melts and breaks the circuit to protect the appliance when the current is too high.

bulb

fuse

circuit breaker

earth wire

Multiple Choice

A/An _____ is NOT a safety electrical device.

fuse

circuit breaker

earth wire

voltmeter

Multiple Choice

Two-pin plugs do NOT have the _____ wire.

Live

Neutral

Earth

Multiple Choice

Which one CANNOT help to prevent electrocution?

Do not use electrical gadgets in wet places

Call electrician to replace damaged wires

Overload an electrical socket

Switch off and plug out plugs before cleaning appliances

Multiple Choice

1 kWh costs 20 cents.

Using a 3 kW lamp for 2 hours will cost _____ cents.

120

Multiple Choice

An electric iron has a power rating of 1800 W.

This means _____ is converted in 1 second.

1800 J

1800 A

1800 V

1800 W

Fill in the Blanks

A 2400 W water heater was used for 15 minutes.

Calculate the electrical energy in kWh consumed by the water heater.

Type answer...

Fill in the Blanks

A 1200 W iron was switched on for 3 hours.

Calculate the electrical energy consumed by the iron in kWh.

Type answer...

Fill in the Blanks

A 1.2 kW microwave oven was used for 2 hours.

What is the electrical energy in kWh consumed by the oven?

Type answer...

Fill in the Blanks

A 0.40 kW lamp was turned on for 8 hours.

What is the electrical energy in kWh consumed by the lamp?

Type answer...

Multiple Choice

How much does it cost to light 6 100 W light bulbs for 6 hours if the price of electrical energy is $0.09/kWh?

$4.00

$6.24

$3.24

$5.24

Multiple Choice

A kilowatt (kW) is how many watts?

100

1000

2ENA Chapter 13 Electrical Systems Part III

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