Поставить в past simple 1.what did mr. otis take from the table? 2. from which table did mr. otis take the bottle? 3.what did mr. otis give the ghost? 4. what did mr. otis do before he looked at his watch? 5. what had mr. otis put on his feet?
1. The ohmmeter is used to measure the value of resistance while it is connected in paralltl to the resistor.
2. The ammeter is connected in series while the current is being measured.
3. While the value of current in the circuit is measured, the ammeter should be connected in series.
1. Suppose the ammeter scale reads 1.9 amp, the voltmeter scale reads 2.4 V; how much is the value of resistance in the measured circuit?
R = U / I = 2.4 / 1.9 = 1.26 Ohm
2. Suppose the ohmmeter scale reads 75 ohms, the voltmeter scale reads 220 V; how much is the value of current in the measured circuit?
I = U / R = 220 / 75 = 2.9 A
3. Suppose that you have a series circuit consisting of three resistors and a voltage source. R1 = 0.18 ohm, R2= 1.15 ohms, R3 = 2 ohms, I=10 amp. Find the voltage drop across each resistor; find the value of voltage in the circuit.
U1 = R1 * I = 0.18 * 10 = 1.8 V
U2 = R2 * I = 1.15 * 10 = 11.5 V
U3 = R3 * I = 2 * 10 = 20 V
Suppose R1 gets open. What does it result in? I = 0
4. Two resistors are connected in series. R1 = 7,000, R2= 2,200, I = 110 amp. Find the voltage drop across each resistor.
U1 = R1 * I = 7,000 * 110 = 770,000 V
U2 = R2 * I = 2,200 * 110 = 242,000 V
Suppose no current passes through the circuit, what does it result from?
1. The ohmmeter is used to measure the value of resistance while it is connected in paralltl to the resistor.
2. The ammeter is connected in series while the current is being measured.
3. While the value of current in the circuit is measured, the ammeter should be connected in series.
1. Suppose the ammeter scale reads 1.9 amp, the voltmeter scale reads 2.4 V; how much is the value of resistance in the measured circuit?
R = U / I = 2.4 / 1.9 = 1.26 Ohm
2. Suppose the ohmmeter scale reads 75 ohms, the voltmeter scale reads 220 V; how much is the value of current in the measured circuit?
I = U / R = 220 / 75 = 2.9 A
3. Suppose that you have a series circuit consisting of three resistors and a voltage source. R1 = 0.18 ohm, R2= 1.15 ohms, R3 = 2 ohms, I=10 amp. Find the voltage drop across each resistor; find the value of voltage in the circuit.
U1 = R1 * I = 0.18 * 10 = 1.8 V
U2 = R2 * I = 1.15 * 10 = 11.5 V
U3 = R3 * I = 2 * 10 = 20 V
Suppose R1 gets open. What does it result in? I = 0
4. Two resistors are connected in series. R1 = 7,000, R2= 2,200, I = 110 amp. Find the voltage drop across each resistor.
U1 = R1 * I = 7,000 * 110 = 770,000 V
U2 = R2 * I = 2,200 * 110 = 242,000 V
Suppose no current passes through the circuit, what does it result from?
It results from the broken circuit.
XI.
1. must;
2. Can;
3. May / needn't / can;
4. May;
5. Do you have to go so early? It's only 9 o'clock. ;
6. have to;
7. can / has to;
8. had to;
9. Should / needn't;
10. may;
11. Can;
12. can;
13. May
XII. Fill in the blanks with a suitable modal verb:
1. Who can answer my question?
2. Can you tell me the way to the station?
3. He has to do this task at once.
4. Should I attend this meeting? – No, you needn’t.
5. She has to be more attentive to her parents.
6. You must have shown your notes to the teacher.
7. I asked him, but he couldn't listen to me.
8. They could have visited her, she was in the hospital.
9. Nobody can translate this text.
10. You needn't come so early.
11. Your friend could have informed us.
12. Last summer we could often go to the country.
13. Your son has to do this work himself.
14. May I leave for a while? – Yes, you may .