Solar Math Quiz 04/01/2024

The hydraulic analogy for voltage is

• Flow

• Volume

• Capacity

• Pressure

The hydraulic analogy for current is

• Flow

• Volume

• Capacity

• Pressure

One horsepower equals

• 0.746kW

• 746kWh

• 1000W

• 1MW

The power of a 250 W module is equal to

• 1/4th of a KW

• 0.025MW

• 25KVA

• 0.25kWh

2000 Watts is equal to

• 20kW

• 2kW

• 0.2kW

• 2kWh

A 200 Watt light is left on for 7 days. How much energy is consumed?

• 34kWh

• 336kW

• 3360Wh

• 14MWh

Answer explanation

24 Hours x 7 days=168 Hours

200 Watts x 168 Hours= 33,600kWh

The answer is A) 34kWh since it is the closest to 33,600kWh

Pay attention for these trick questions, sometimes you might need to round up.

Tags

NGSS.HS-PS3-1

A pump works at 4A and 12V for 3 hours. How much energy does it consume?

• 144kWh

• 48Wh

• 0.144kWh

• 96Wh

Answer explanation

Volts x Amps = Watts (V x A = W)

12V x 4A = 48W = Power

Power x Time = Energy 

48W x 3hours = 144Wh

144Wh/1000W/kW = 0.144kWh

Tags

NGSS.HS-PS3-1

Current required to send one MW (million watts) at the voltage of one MV (million volts)

• 1A

• 1 million Amperes

• 1Ah

• 100A

Answer explanation

Volts x Amps = Watts

Amps = Watts/Volts

Amps = 1,000,000W/1,000,000V

High voltage is the most efficient way to transport electricity

An Ampere is the same as an amp is abbreviated A

If a 100W light bulb is working on a 120V socket, what is the current?

• 12kW

• 0.83A

• 1.2A

• 144 Ohms

Answer explanation

Volts x current = power (V*I = P)

I = P/V

I = 100W/120V = .0833A

100W divided by 120V = 0.83A

Tags

NGSS.HS-PS2-5

If you use a 100 watt light bulb for 1 hour how many watt hours have you used?

• 10 Wh

• 60 Wh

• 100 Wh

• 40 Wh