9_Resistance, Electrical Power and Energy

Multiple Choice

What unit is used to measure resistance?

• Ohms

• Omega

• Volts

• Amps

Multiple Choice

What is the current in a circuit with 6 ohms of resistance and a battery containing 24 Volts?

• 1/4 A

• 144 A

• 4 A

• 0.4 A

Multiple Choice

What is the resistance of a lightbulb that experiences 9 Volts and 3 amps of current?

• 1/3 ohms

• 3 ohms

• 27 ohms

• 9 ohms

Multiple Choice

What is the voltage of a circuit with 4 ohms of resistance and 3 amps of current?

• 12 V

• 21 V

• 4/3 V

• 3/4 V

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

Which wire has more resistance (long or short)?

Multiple Choice

Resistivity depends upon _______ of the wire and it's SI unit is _____ .

• material of the wire; Ωm

• length of the wire; Ω

• material of the wire; Ω

• cross sectional area and length of the wire; Ωm

Multiple Choice

Choose the correct statement: Assertion (A): Current is decreased when length of the wire is increased. Reason (R): Resistance in a circuit is directly proportional to the length of the wire.

• Both A and R are true and R is the correct explanation of A

• Both A and R are true but R is not the correct explanation of A

• A is true but R is false

• Both A and R are false

Multiple Choice

What will happen to the resistance if the radius of the wire is made twice and length becomes half?

• Resistance will become 4 times

• Resistance will become 8 times

• Resistance will become half

• Resistance will become 1/8 times

Draw

It is known that a conducting wire has a length of 100 m, a cross-sectional area of 2.5 mm², and a specific resistance of 17 x 10-7 m. Determine the resistance of the wire!

Multiple Choice

What is the formula for calculating power?

• Power = Mass x Acceleration

• Power = Force x Distance

• Power = Work / Time

• Power = Voltage / Current

Multiple Choice

If a circuit has a resistance of 10 ohms and a current of 2A, what is the power dissipated in the circuit?

• The power dissipated in the circuit is 20 watts.

• The power dissipated in the circuit is 5 watts.

• The power dissipated in the circuit is 15 watts.

• The power dissipated in the circuit is 40 watts.

Multiple Choice

What is the unit of power?

• Watt

• Ohm

• Ampere

• Volt

Multiple Choice

A motor has a power output of 500W and operates at a voltage of 240V. What is the current drawn by the motor?

• 10A

• 0.5A

• 5.12A

• 2.08A

Multiple Choice

What is the power consumption of a device with a resistance of 50 ohms and a current of 4A?

• The power consumption of the device is 200 watts.

• The power consumption of the device is 400 watts.

• The power consumption of the device is 1000 watts.

• The power consumption of the device is 800 watts.

Draw

If it is known that an object has a power of 500 W in 30 minutes. How much electrical energy is in Kwh?

​Example

Subject | Subject

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​Mr.Iwan uses the following power tools every day. 4 10W lamps are on for 10 hours, 1 300 W iron is used for 1 hour, 1 100 W TV runs for 6 hours, If the price per kWh is IDR 1,000, calculate the electricity bill that must be paid by Mr. Iwan in March 2021!

Answer

Subject | Subject

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​Determine in advance the electrical energy consumed every day, namely:

W = 4(10 W)(10 hours) + (300 W)(1 hour) + (100 W)(6 hours)

W = 400 Wh + 300 Wh + 600 Wh W = 1300 Wh

W = 1.3 kWh/day

​Answer

Subject | Subject

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​In March 2021 there are 31 days, then the electricity bill that must be paid by Mr. Iwan in March 2021 are: Cost = (1.3 kWh/day)(Rp1,000/kWh)(31 days)

Cost = IDR 40,300

Draw

In daily household use:

3 pieces of 50W bulbs on for 5 hours,

5 pieces of 20W bulbs on for 5 hours,

a 150 W TV is on for 4 hours,

a 300 W iron runs 2 hours.

If the price per kWh is Rp. 1,000.00, calculate the electricity bill that must be paid for one month (30 days).

Example

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Happy teaching!Pak Iwan uses the following power tools every day.

4 10W lamps are on for 10 hours,

a 300 W iron is used for 1 hour,

a 100 W TV runs for 6 hours,

If the price per kWh is IDR 1,000, calculate the electricity bill that must be paid by Mr. Iwan in Mar

Subject | Subject

Some text here about the topic of discussion