1. what is the si unit of emf? 2.a complete series circuit consists of a 12.0 v battery, a 4.70 ω resistor, and a switch in the closed position. the internal resistance of the battery is 0.30 ω. what does an ideal voltmeter read when placed across the resistor?

1. The volt is the derived SI unit for EMF that has been given a special name. It is equivalent to a watt per ampere, where the watt, too, is a derived unit.

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2. Total circuit resistance is 4.7Ω + 0.3Ω = 5.0Ω, so the circuit current is ...

  (12 V)/(5.0 Ω) = 2.4 A

Then the voltage across the resistor is ...

... (2.4 A)×(4.7 Ω) = 11.28 V ≈ 11.3 V

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Comment on Ohm's Law

I've found the attached diagram to be helpful for remembering the relationships involved in Ohms Law. If you cover the letter of the variable you want to find, the other two show you how to find it.

V = I×R

I = V/R

R = V/I

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation: