20 12 Dave connects an electric circuit to find the resistance of 100 cm of wire. Look at the diagram below. 9V 100 cm of wire The battery voltage is 9v. The reading on the ammeter is 2A. The reading on the voltmeter is 5V. (a) Calculate the resistance of the 100 cm of wiro. (b) Dave now uses some thinner wire. A 100 cm length of this wire has a resistance of 5 ohms. What length of this wire is needed to make a 2 ohm resistor?

20 12 Dave connects an electric circuit to find the resistance of 100 cm of wire. Look at the diagram below. 9V 100 cm of wire The battery voltage is 9v. The reading on the ammeter is 2A. The reading on the voltmeter is 5V. (a) Calculate the resistance of the 100 cm of wiro. (b) Dave now uses some thinner wire. A 100 cm length of this wire has a resistance of 5 ohms. What length of this wire is needed to make a 2 ohm resistor?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter22: Electric Current

Section22.1: Current And Circuits

Problem 9PP

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